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The most common Atarax side effect is drowsiness which is usually temporary and may disappear within a few days or when the dosage is reduced. Other important Atarax side effects that may occur include dry mouth, twitches, tremors and convulsions.
Common Side Effects of Antidepressants. Antidepressants can sometimes cause a wide range of unpleasant side effects, including: 1  nausea. 2  increased appetite and weight gain. 3  loss of sexual desire and other sexual problems, such as erectile dysfunction and decreased orgasm. 4  fatigue and drowsiness. 5  insomnia. 6  dry mouth. 7  blurred vision.8  constipation.ommon Side Effects of Antidepressants. Antidepressants can sometimes cause a wide range of unpleasant side effects, including: 1  nausea. 2  increased appetite and weight gain. 3  loss of sexual desire and other sexual problems, such as erectile dysfunction and decreased orgasm. 4  fatigue and drowsiness. 5  insomnia. 6  dry mouth. 7  blurred vision.