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Doctors' Answers to "Frequently Asked Questions" - Phenobarbital
Phenobarbital Side Effects [posted 7/31/98]
Answer: Usually seen right away or not at all. Sedation and drowsiness are the most common side effect, but some do experience decreased sexual drive and difficulty with orgasm. However, this would be uncommon if you did not experience it right away while taking the drug. Has your blood level been checked lately?