According to uspharmacist.com, there are certain OTC medications that may cause drowsiness. (See below). In addition, OTC meds with stimulants such as caffeine may indirectly cause drowsiness by interfering with normal sleep patterns.
Analgesics: Certain analgesic combinations may induce drowsiness, especially those combination containing diphenhydramine, phenyltoloxamine or salicylamide.15 These ingredients are not approved by the FDA in these combinations.
Nonsteroidal agents also may induce drowsiness (e.g., ibuprofen, naproxen).
For more info, visit www.uspharmacist.com/oldformat.asp?url=newlook/files/cons/acf2f4b.htm
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