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See the DrugPatentWatch profile for benadryl
No major interactions exist between Benadryl (diphenhydramine) and nebivolol (Bystolic), a beta-blocker for high blood pressure. Both are metabolized by the liver via CYP2D6, but clinical data shows no significant pharmacokinetic clashes or increased adverse effects at standard doses.[1][2]
Both drugs cause drowsiness—Benadryl strongly as an antihistamine, nebivolol mildly. Combining them can amplify sedation, impairing driving or operating machinery. Nebivolol may also slow heart rate; Benadryl rarely affects this, but monitor for dizziness or fatigue in elderly patients or those with heart conditions.[1][3]
People with glaucoma, prostate issues, or respiratory problems face higher risks from Benadryl's anticholinergic effects, which nebivolol doesn't worsen but doesn't offset. Beta-blocker intolerance or low blood pressure could compound issues. Always check with a doctor or pharmacist for personal factors like dose, age, or other meds.[2][4]
Tools like Drugs.com rate it "moderate" due to sedation additivity, not a direct clash. No FDA warnings or black-box alerts apply. WebMD and RxList echo this: safe short-term but use caution with alcohol or other sedatives.[1][3] Sources [1]: Drugs.com - Benadryl and Nebivolol Interaction [2]: RxList - Nebivolol Drug Interactions [3]: WebMD - Diphenhydramine Interactions [4]: Mayo Clinic - Beta Blocker Precautions
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