Hello Dear. I dont think the bruises on your body is related to effexor. Unless you have some allergic reaction to the drug, which should have developed the first time itself when you consumed those drugs. For your information the most common side effects of effexor- dizziness, drowsiness, headache, insomnia, nausea, nervousness, anorexia, decreased appetite, dry mouth. Since you are developing bruises kindly consult a doctor who may do complete blood count and see your platelet levels and also coagulation profile. If platelets are low or if there is deficiency of clotting factors then bruises may develop. You may need to undergo detailed evaluation. Hope i have answered your question. Feel free to contact me if you have any more questions. I ll be glad to help you. All the best With warm regards Dr Sanjay Kini