Pexeva sometimes can take weeks to take effect and may induce unpleasant symptoms while your body is getting used to the drug. Generic Pexeva may cause you to feel suicidal in the first week of taking it. Side effects may include easy bruising or bleeding (such as a nosebleed); very stiff (rigid) muscles, high fever, sweating, fast or uneven heartbeats, tremors, overactive reflexes; nausea, vomiting, diarrhea, loss of appetite, feeling unsteady, loss of coordination; or headache, trouble concentrating, memory problems, weakness, confusion, hallucinations, fainting, seizure, shallow breathing or breathing that stops. Less severe effects include feeling nervous; drowsiness, dizziness; sleep problems (insomnia); mild nausea, constipation; weight changes; decreased sex drive, impotence, or difficulty having an orgasm; or dry mouth, yawning, or ringing in your ears. This is not a complete list of side effects and others may occur, so make sure to consult your local doctor when you buy Pexeva online.