Antihistamines as a whole decrease blood flow to the penis and are well known to cause erectile dysfunction. To add to that, they’re also more common than you think. Sure, you know Benadryl, Claritin, and Zyrtec, but doctors also often prescribe these drugs to manage nausea, relax stiff muscles, and induce sleep. Examples of these drugs include Phenergan, Flexeril, and Unisom.
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