Possible side effects are constipation, dizziness, headache, indigestion, nausea, vomiting, tiredness, weakness, shortness of breath, swelling of hands or feet, trouble breathing, chest pain, itching or rash, depression, fainting, irregular heart beat, hallucinations, cough, or confusion. Warning: it also says that I may develop behavioral changes such as an increase in aggression, gambling or sexual urges. Well, if you happen to see me angrily headed to Las Vegas with a pimp in the car, call Wayne.