Dear Shelby, Phenergan can have a sleepy side effect if you are not used to them. I have Crohns Disease and have to take 4 a day; with meals and at bed time. Without it I would vomit profusely most anything I eat. I wonder why you needed 1 1/2. 1- 25mg always works for me. I would just go ahead and sleep it off and not do it again since it made you feel this way. Taken with a meal lessens this sleepy effect, at least for me. Good Luck, hon.
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