Tenex (guanfacine) side effects: are both drowsiness as well as lowering BP, so often started at night. The drowsy symptoms usually improve after several days, but if he is really fatigued, I recommend that you have his blood pressure checked to be sure that is ok. You do not state his dose, and he may well respond to a smaller dose. XS drowsiness will also affect focus, a reason for giving Tenex (guanfacine). Report his response to his doc.
Answered 11/4/2014
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