Can i take benadryl with xyzal

1. Drowsiness. Drowsiness is a common Xyzal side effect. It was reported by 5% to 6% of people taking the medication in clinical trials. Xyzal is more likely to cause drowsiness compared to some other second-generation antihistamines like Claritin (loratadine) and Allegra (fexofenadine).

One possible reason this may happen is because histamine can reduce your appetite. So taking an allergy med — which blocks histamine — could counteract this effect, ... (Xyzal) Loratadine (Claritin) ... First-generation antihistamines like Benadryl, however, can cause potential side effects if you take them daily (especially if you're an ...Compare Benadryl vs Xyzal head-to-head with other drugs for uses, ratings, cost, side effects and interactions.Sep 25, 2023 · Scientific Support For Unbearable Itching: Xyzal is a closely related medication to Zyrtec. As mentioned, the generic name for the Zyrtec antihistamine is cetirizine ( su-TEER-a-zeen ). The generic name for Xyzal is (levo)cetirizine. This too produced unbearable itching when people suddenly stopped taking it. Allegra. Zyrtec. Claritin (loratadine) Clarinex (desloratadine) Xyzal (levocetirizine) In some cases, drugs with antihistamine properties may be used intentionally to cause weight gain. That's the case, for example, with some antihistamines used to stimulate appetite in people diagnosed with cystic fibrosis.Diphenhydramine (Benadryl, Nytol, Sominex) Doxylamine (Vicks NyQuil, Tylenol Cold and Cough Nighttime) These antihistamines start to take effect in about 30 to 60 minutes and last for four to six ...

One possible reason this may happen is because histamine can reduce your appetite. So taking an allergy med — which blocks histamine — could counteract this effect, ... (Xyzal) Loratadine (Claritin) ... First-generation antihistamines like Benadryl, however, can cause potential side effects if you take them daily (especially if you're an ...As for the question, yes. You can take allergy medication and probiotics at the same time. Probiotics typically have very mild side effects that amount to bloating or gas, and because they are not drugs, they do not function in ways that could lead to dangerous interactions when mixed with other drugs. In fact, taking allergy medication and ..."The worst-case scenario is the disintegration of society." Andrew Yang doesn’t mince his words: He doesn’t think the robots are coming; he knows they are already here. And he want...Benadryl can be dehydrating, and is known to cause side effects like dry mouth and eyes. It can also cause undesirable and possibly even unsafe side effects like drowsiness and blurred vision. This article details the side effects of Benadryl. It also lists drugs that may interact with Benadryl, along with who Benadryl is—and is not ...Antihistamines seem to help a subset of long COVID patients. Over-the-counter antihistamines, typically taken for allergies, may help relieve the debilitating symptoms of long COVID in some people ...Applies to: diltiazem and Benadryl (diphenhydramine) DilTIAZem and diphenhydrAMINE may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose ...Nasacort disease interactions. There are 4 disease interactions with Nasacort (triamcinolone nasal) which include: hyperadrenocorticism. infections. ocular herpes simplex. ocular toxicities.Feb 2, 2024 · Chronic Idiopathic Urticaria. Adults and Children 12 Years of Age and Older. The recommended dose of XYZAL is 5 mg (1 tablet or 2 teaspoons [10 mL] oral solution) once daily in the evening. Some patients may be adequately controlled by 2.5 mg (1/2 tablet or 1 teaspoon [5 mL] oral solution) once daily in the evening. Children 6 to 11 Years of Age.

Wrap Up. Xyzal and Allegra are antihistamines that effectively treat allergy symptoms by blocking histamine receptors. However, studies show Xyzal may have better efficacy compared to Allegra. Additionally, Xyzal tends to have fewer side effects than Allegra, although both can cause drowsiness and headaches.More people say they are less likely to buy homes as prices rise. Millennials are especially unlikely to buy because of the housing market. By clicking "TRY IT", I agree to receive...Scientific Support For Unbearable Itching: Xyzal is a closely related medication to Zyrtec. As mentioned, the generic name for the Zyrtec antihistamine is cetirizine ( su-TEER-a-zeen ). The generic name for Xyzal is (levo)cetirizine. This too produced unbearable itching when people suddenly stopped taking it.Basic Medications for Symptomatic Patients with Mast Cell Diseases1-4. H1 antihistamines: help with itching, abdominal pain, flushing, headaches, brain fog. H2 antihistamines: help with gastrointestinal symptoms and overall mast cell stability (all mast cell activation symptoms) Mast cell stabilizers: help with stomach and intestinal symptoms ...So you’d want to wait until it’s been at least 24 hours since taking Zyrtec to take Benadryl (or another antihistamine). On the flip side, Benadryl doesn’t last as long …Decongestants, such as Sudafed (pseudoephedrine), provide the fastest relief but shouldn’t be taken long term. Antihistamines, such as Claritin (loratadine), can provide quick relief and can help prevent symptoms if taken every day. Nasal steroids, such as Flonase (fluticasone propionate), are generally the most effective allergy medicines ...

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If there is no histamine, then antihistamines can’t relieve symptoms. If antihistamines aren’t working for you and you have allergy-like symptoms, it may not be a bad allergy season—but instead something non-allergic you’re reacting to. Symptoms of nonallergic rhinitis include:1. Sneezing. Runny or stuffy nose.blurry vision; drowsiness; problems with urination. Dosage. The recommended dose for Xyzal is 5 mg orally once per day in the evening. The recommended Benadryl dose for children 6 to 12 years old is 12.5 mg to 25 mg every 4 to 6 hours. For adults and children over 12, the dose is 25 mg to 50 mg every 4 to 6 hours.Last updated May 14, 2024. Key points. Benadryl (diphenhydramine) and Xyzal (levocetirizine) generally shouldn't be taken at the same time as they are in the same drug class (antihistamines). Combining both may result in additive side effects. Benadryl only lasts around 4 to 6 hours per dose, and Xyzal can safely taken after this period of time.High doses of antihistamines—even the “non-sedating” kind—can cause drowsiness and rapid heart rate. Medicines such as Zyrtec and Claritin are only “non-drowsy” at the FDA-approved dose. What’s more, an overdose of the “sedating” antihistamines (think Benadryl) can cause adverse events like seizures and hallucinations.Although you can mix some allergy medications, combining certain medications can raise the risk of serious side effects. Oral antihistamines, such as Zyrtec and Benadryl, shouldn’t be taken together without a healthcare provider’s OK.

Some allergy medications include ingredients that can cause pupil dilation resulting in a condition called acute angle-closure glaucoma. When allergies make you feel miserable and congested, many people reach for over-the-counter (OTC) allergy and decongestant medications — whether in pill, liquid form, or nasal sprays — at their local ...Take it at night for 24 hours of continuous allergy relief that won’t fade into the next day. Take Xyzal at night for 24 hours of continuous adult allergy relief that won't fade. Powerful allergy relief that's just as effective at hour 24 as at hour 1. View adult products. Give your little ones Xyzal ® before bedtime for 24 hours of ...Summary. Taking too much antihistamine can lead to adverse side effects and a potential antihistamine overdose. Signs may include fast heart rate, fever, and dilated pupils. Antihistamines are a ...To ease allergy symptoms, antihistamine tablets (which target allergy cells in the body), including well-known brands like Piriton (chlorpheniramine) and Clarityn (loratadine), are generally safe to use. Targeted eye drops and nasal sprays are also generally safe. Sodium cromoglycate-containing preparations, such as Opticrom Eye Drops, are ...Levocetirizine is used to relieve the symptoms of hay fever and hives of the skin. It is an antihistamine that works by preventing the effects of a substance called histamine, which is produced by the body. Histamine can cause itching, sneezing, runny nose, and watery eyes. It can also close up the bronchial tubes (air passages of the lungs ...Xyzal Allergy 24HR tablets (levocetirizine oral tablet, 5 mg) The tablets comes in package sizes of 10, 35, 55, 80 or 110-count tablets. Adults 65 years of age: ask a doctor before use. Adults and children 12 to 64 years of age: take one 5 mg tablet once daily in the evening. Do not take more than 1 tablet (5 mg) in 24 hours.Xyzal (Levocetirizine) Generic Name: Levocetirizine. Levocetirizine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms such as a ...Xyzal (levocetirizine) All of the second generation antihistamines last 24 hours per dose and are non-drowsy (with the exception of Zyrtec). While comparative studies generally show no significant difference in efficacy between the drugs, Xyzal does appear to be the most potent and effective medication for allergen induced reactions in …May 4, 2023 · Xyzal (levocetirizine) is a once-daily over-the-counter (OTC) medication that can help treat seasonal allergies. It’s safe for most adults and children ages 2 years and older to take. The typical adult Xyzal dosage is 5 mg by mouth once a day. Children’s Xyzal dosages depend on a child’s age and range from 1.25 mg to 5 mg by mouth once daily. Adults and Children 12 Years of Age and Older. The recommended dose of XYZAL is 5 mg (1 tablet or 2 teaspoons [10 mL] oral solution) once daily in the evening. Some patients may be adequately controlled by 2.5 mg (1/2 tablet or 1 teaspoon [5 mL] oral solution) once daily in the evening. Children 6 to 11 Years of Age.

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18 May 2023 ... I just do an around the world and take a Xyzal, Claritin, Zyrtec, and Allegra all at once to guarantee some kind of result. UpvoteHow frequently can I take BENADRYL®? You can take it every 4 to 6 hours, or as directed by your doctor. Do not take more than 6 doses in 24 hours. Follow this helpful BENADRYL® Dosage Chart to learn more about proper dosing. Can I take BENADRYL® while pregnant or breastfeeding? If pregnant or breastfeeding, ask a health professional …Cromolyn: A mast cell stabilizer which helps to prevent histamine and other inflammatory mediators from being released into circulation. Cromolyn is available as a nasal spray and nebulizer solution. Vitamin C: Decreases histamine formation. Very often, a combination of drugs is recommended (e.g. H1 blocker, H2 blocker, Cromolyn and Vitamin C ...Chronic Idiopathic Urticaria. Adults and Children 12 Years of Age and Older. The recommended dose of XYZAL is 5 mg (1 tablet or 2 teaspoons [10 mL] oral solution) once daily in the evening. Some patients may be adequately controlled by 2.5 mg (1/2 tablet or 1 teaspoon [5 mL] oral solution) once daily in the evening. Children 6 to 11 Years of Age.Benadryl (diphenhydramine) biotin; bupropion; cyclobenzaprine; Cymbalta (duloxetine) duloxetine; estradiol; gabapentin; hydroxyzine; ibuprofen; levothyroxine; losartan; magnesium oxide ... Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan. Unknown: No ..."The response from students in the survey reinforces the importance and preference for healthy, conducive social environments that promote learning and development." As the school ...diphenhydrAMINE levocetirizine. Applies to: Benadryl (diphenhydramine) and Xyzal (levocetirizine) Using levocetirizine together with diphenhydrAMINE may increase side effects such as dizziness, drowsiness, and difficulty concentrating. Some people, especially the elderly, may also experience impairment in thinking, judgment, and motor coordination.First-generation allergy medicines, like Benadryl, and alcohol. If your allergy med of choice is diphenhydramine, also known as Benadryl, the answer is an emphatic NO. ... This is not to say, however, that it is okay to go on …

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There are several brands of oral antihistamines on the market. Some, like Benadryl, are very effective at reducing allergy symptoms but can cause drowsiness. And for kids under age 6, Benadryl can sometimes cause hyperactivity. Newer medications such as Claritin, Allegra, Xyzal or Zyrtec have reduced these side effects.The bottom line. Second- and third-generation antihistamines are often referred to as being “non-drowsy.”. But some of them are more likely to cause drowsiness than others. Allegra (fexofenadine) is the least likely antihistamine to cause drowsiness. Zyrtec (cetirizine), though, can make you feel drowsy, even at regular doses. Summary: Drug interactions are reported among people who take Xyzal and Benadryl. Common interactions among females include erythema and malaise. Common interactions among males include hereditary angioedema and chronic kidney disease. The phase IV clinical study analyzes what interactions people have when they take Xyzal and Benadryl together. Until now, the guards—employed by the private company that administers the detention center—were prohibited from using pepper spray. An ICE immigration detention center in South Fl...A Xyzal® 5mg breakable (scored) tablet once daily in the evening is the dosage for adults and children from 12 to 64 years of age. A 1/2 tablet (2.5 mg) once daily in the evening …Hi A. Clark, Zyrtec is well tolerated by most children and adults. In clinical trials 14 percent of adults have side effects of drowsiness and fatigue. People over 65 years of age did not have an ...Jul 15, 2021 · Exact Answer: 24 Hours. Both of the drugs, i.e., Xyzal and Benadryl are used to treat a person showing symptoms of any kind of allergy. Xyzal and Benadryl are the brand names for the drugs Levocetirizine and Diphenhydramine, respectively. One year after the ALS Ice Bucket Challenge went viral, what has the ALS Association done with the $115 million? By clicking "TRY IT", I agree to receive newsletters and promotions...Post-dose observation time: 48-hour no-fly after the first dose AND 4-hour no-fly after each subsequent dose. ACCEPTABLE* (Non-Sedating) Antihistamine and Allergy Medications. May be used as a single agent or in any combination product, if other certification criteria are met. Oral: Most Second-Generation Histamine-H1 receptor antagonist.unusual excitement, nervousness, restlessness, or irritability. unusual sleepiness, weakness or drowsiness, extreme tiredness. Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional. Call your doctor for medical advice about side effects.More than half of American adults take an herbal or dietary supplement, and many more use over-the-counter or prescription drugs to manage maladies ranging from the occasional headache to chronic health conditions or mood disorders.. For many, it is part of their daily routine. But if you’re planning to have surgery, you may need to take a break … ….

blurry vision; drowsiness; problems with urination. Dosage. The recommended dose for Xyzal is 5 mg orally once per day in the evening. The recommended Benadryl dose for children 6 to 12 years old is 12.5 mg to 25 mg every 4 to 6 hours. For adults and children over 12, the dose is 25 mg to 50 mg every 4 to 6 hours.These include Allegra and Xyzal. ... like Benadryl, have negative effects on breastfeeding and should be avoided if possible. Medicines like this decrease milk supply if used at high doses and for ... janier7563. ADMIN MOD. I had to call poison control on myself. Took two antihistamines by accident. I can't believe I accidentally took two antihistamines. I usually take some pills in the morning that I have to wait a half hour for the rest of my vitamins. Well, I usually take my antihistamines with the first set of pills. diphenhydramine (Benadryl, Sominex) doxylamine (Vicks Nyquil) ... (Xyzal) loratadine (Alavert, Claritin) Learn more about antihistamines. Drugs for severe allergic reactions.If there is no histamine, then antihistamines can’t relieve symptoms. If antihistamines aren’t working for you and you have allergy-like symptoms, it may not be a bad allergy season—but instead something non-allergic you’re reacting to. Symptoms of nonallergic rhinitis include:1. Sneezing. Runny or stuffy nose.Some allergy medications include ingredients that can cause pupil dilation resulting in a condition called acute angle-closure glaucoma. When allergies make you feel miserable and congested, many people reach for over-the-counter (OTC) allergy and decongestant medications — whether in pill, liquid form, or nasal sprays — at their local …Sneezing. Xyzal is taken once daily and generally lasts around 24 hours per dose. Side effects may include drowsiness in a low percentage of users. This medication may be taken in the evening if drowsiness occurs. Sudafed (pseudoephedrine) is a decongestant used to treat sinus congestion and pressure caused by the common cold or allergies.It is typically considered safe to use this with Xyzal or really any other antihistamine. Benadryl cream is usually not very well absorbed into the skin unless it is used over a very large area of the skin or applied directly on top of an open wound. As long as your mosquito bites aren’t covering both of your legs completely, you shouldn’t ...These include oral medications like: Cetirizine (Zyrtec) Fexofenadine (Allegra) Loratadine (Claritin) Levocetirizine (Xyzal) Desloratadine (Clarinex) If you have a runny or itchy nose, nasal sprays …Zyrtec Dosing Options For 24 Hour Coverage. First, Zyrtec dosing may be split into twice daily dosing to have a more consistent effect. Since the maximum dose is 10 mg daily, taking 5 mg in the morning and 5 mg prior to bedtime may help. Another option would be to switch to taking the full 10 mg prior to bedtime. Can i take benadryl with xyzal, First-generation antihistamines, such as Benadryl (diphenhydramine), are the most likely to reach the brain and affect the nervous system. They’re also more likely …, So, I'll take 'allergy medicine' to encompass the two most commonly used classes of medication to prevent and provide relief from allergies: Antihistamines; Nasal decongestants; Antihistamines include: Claritin (loratadine) Zyrtec (cetirizine) Allegra (fexofenadine) Xyzal (levocetirizine) Benadryl (diphenhydramine) Nasal decongestants include:, Sep 11, 2023 · The main one for antihistamines is drowsiness, so it can be tough to take during the day. That's why they're often included in nighttime cold medicines. Other common side effects include dry mouth ... , Jun 24, 2022 · Both Xyzal (levocetirizine) and Claritin are second-generation antihistamines, which are noted for their long duration of action (around 24 hours) and mild sedative side effects when compared to first-generation antihistamines, like Benadryl. Some sources classify Xyzal as a third-generation antihistamine, as it is a derivative of Zyrtec ... , Can I Take Xyzal and Benadryl Together at the Same Time? No, you should not use Xyzal and Benadryl together. It is not advisable to take multiple different oral …, What Is Benadryl (Diphenhydramine)? Benadrylis a sedating antihistamine used most commonly for the treatment of allergic reactions, seasonal allergies, symptoms associated with the common cold and insomnia. Benadryl may be taken without regard to meals. commonly reported side effects associated with taking Benadryl include but are …, Watch this video to find out about our backyard makeover, including adding a hot tub, installing a playset, putting in landscape lighting, and more. Expert Advice On Improving Your..., Nonsedating antihistamines can relieve itching, sneezing, runny nose and watery eyes. Options include: Loratadine (Claritin), cetirizine (Zyrtec), levocetirizine (Xyzal) and fexofenadine (Allegra) all are available without prescription. Oral decongestants, like pseudoephedrine (Sudafed) and phenylephrine (Sudafed PE) can ease stuffiness, and ..., Mar 24, 2021 · Yale University’s 2010 observational obesity study found that there appeared to be a correlation between the use of Allegra (fexofenadine) and Zyrtec (cetirizine) and weight gain. Benadryl (diphenhydramine) has also been linked to weight gain in some patients. However, newer antihistamines such as Claritin (loratadine) are associated with ... , Yes you can: Yes you can,there is no drug interaction. Take the lowest dose: They both can cause drowsiness, dizziness, motor impairment and respiratory depression. If you need to take both of them, you should take the lowest effective doses. Try to get off of hydrocodone once the indication for it has resolved., Here are some of the most common antihistamine side effects that you should know about. 1. Sedation. Feeling drowsy or sleepy is one of the most common antihistamine side effects, especially in ..., This includes the prescription drug Xyzal (levocetirizine) and over-the-counter (OTC) drugs like: Claritin (loratadine) Zyrtec (cetirizine) ... Can pregnant women take Benadryl? Benadryl (diphenhydramine) is widely used in pregnancy and is generally thought to be safe. Keep in mind that there is some evidence it may cause uterine …, Two popular FDA-approved allergy medicines are Xyzal (levocetirizine) and Claritin (loratadine). Both medications are known as H1 blockers, or antihistamines. By blocking the action of histamine, they treat allergy symptoms. Xyzal and Claritin are less sedating than first-generation antihistamines like Benadryl (diphenhydramine)., Applies to: Xyzal (levocetirizine) Alcohol can increase the nervous system side effects of levocetirizine such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with levocetirizine., Many millennials are saving 15% or more in their 401(k) plans, which puts them on track to a $1 million by retirement. By clicking "TRY IT", I agree to receive newsletters and prom..., 6. Alcohol. Alcohol and Benadryl have sedative functions, so you can experience adverse effects when taken together or within the same time frame. Combining alcohol and Benadryl can lead to drowsiness, dizziness, difficulty concentrating, poor motor skills, and an increased risk of drug overdose., Some newer antihistamines, known as second generation antihistamines, cause less sleepiness than older products. Examples include cetirizine (brand Zyrtec), fexofenadine (brand Allegra), levocetirizine (brand Xyzal) and loratadine (brand Claritin). These antihistamines usually last 12 to 24 hours. Everyone’s body is different so there ..., Applies to: hydroxyzine and Xyzal (levocetirizine) Using levocetirizine together with hydrOXYzine may increase side effects such as dizziness, drowsiness, and difficulty concentrating. Some people, especially the elderly, may also experience impairment in thinking, judgment, and motor coordination. You should avoid or limit the use of alcohol ..., Summary: Drug interactions are reported among people who take Xyzal and Benadryl. Common interactions among females include erythema and malaise. Common interactions among males include hereditary angioedema and chronic kidney disease. The phase IV clinical study analyzes what interactions people have when they take Xyzal and Benadryl together. , May 8, 2023 · 1. Drowsiness. Drowsiness is a common Xyzal side effect. It was reported by 5% to 6% of people taking the medication in clinical trials. Xyzal is more likely to cause drowsiness compared to some other second-generation antihistamines like Claritin (loratadine) and Allegra (fexofenadine). , Applies to: diltiazem and Benadryl (diphenhydramine) DilTIAZem and diphenhydrAMINE may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose ... , 1. Diphenhydramine (Benadryl) One of the reasons that your dog's skin is inflamed and itchy is histamine, a chemical that causes us to sneeze and causes dogs to itch and scratch. The antihistamines will help …, Unlike Benadryl, which lasts only four to six hours, Zyrtec is effective for 24 hours, meaning you only have to take it once daily. It also works faster than Benadryl, according to a position ..., Although you can mix some allergy medications, combining certain medications can raise the risk of serious side effects. Oral antihistamines, such as Zyrtec and Benadryl, shouldn’t be taken together without a healthcare provider’s OK., Apr 21, 2022 · Key takeaways: Xyzal (levocetirizine) and Zyrtec (cetirizine) both belong to the same medication class — antihistamines. Both can be helpful in treating allergies. Side effects of Xyzal versus Zyrtec may vary from person to person. Some people may experience less drowsiness with Xyzal. But both are considered “non-drowsy” allergy medications. , Xyzal is available over-the-counter ( OTC ). Side effects of Singulair and Xyzal that are similar include diarrhea, tiredness/fatigue, stuffy nose, sore throat, and cough. Side effects of Singulair that are different from Xyzal include skin rash, mood changes, tremors, headache, stomach pain, heartburn, upset stomach, nausea, tooth pain, fever ... , That's true for herbs and supplements, too. Antihistamines are the most common medication for allergies. Most of them seem to be safe if you have high blood pressure -- but again, ask to make sure ..., To ease allergy symptoms, antihistamine tablets (which target allergy cells in the body), including well-known brands like Piriton (chlorpheniramine) and Clarityn (loratadine), are generally safe to use. Targeted eye drops and nasal sprays are also generally safe. Sodium cromoglycate-containing preparations, such as Opticrom Eye …, levocetirizine food. Applies to: Xyzal (levocetirizine) Alcohol can increase the nervous system side effects of levocetirizine such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with levocetirizine., As for the question, yes. You can take allergy medication and probiotics at the same time. Probiotics typically have very mild side effects that amount to bloating or gas, and because they are not drugs, they do not function in ways that could lead to dangerous interactions when mixed with other drugs. In fact, taking allergy medication and ..., Adults and Children 12 Years of Age and Older. The recommended dose of XYZAL is 5 mg (1 tablet or 2 teaspoons [10 mL] oral solution) once daily in the evening. Some patients may be adequately controlled by 2.5 mg (1/2 tablet or 1 teaspoon [5 mL] oral solution) once daily in the evening. Children 6 to 11 Years of Age., Sudafed ( pseudoephedrine) and Benadryl ( diphenhydramine) can be safely taken together as there is no interaction between the two medications. In fact, there are products available over the counter that combine both ingredients to ease administration of both drugs. However, it is important to be aware that Benadryl and Sudafed can have ..., Applies to: diltiazem and Benadryl (diphenhydramine) DilTIAZem and diphenhydrAMINE may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose ...