Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:
confusion, unusual thoughts or behavior;
unusual risk-taking behavior, decreased inhibitions, no fear of danger;
depressed mood, thoughts of suicide or hurting yourself;
hyperactivity, agitation, hostility;
feeling light-headed, fainting;
muscle twitching, tremor;
fever, chills, body aches, flu symptoms;
jaundice (yellowing of the skin or eyes); or
urinating less than usual or not at all.
Less serious side effects are more likely to occur, such as:
sleep problems (insomnia);
muscle weakness, lack of balance or coordination;
nausea, vomiting, constipation;
skin rash; or
loss of interest in sex.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.