Side effects of Narcan include; headache, profuse sweating, blurred or double vision, uncontrollable shaking, slurred speech, cough, dry mouth, stiff or swollen joints, chapped lips, inability to hold bowels or bladder, voting democrat, labored breathing, muscle pain or weakness, yellowing of the toe and fingernails and uncontrollable smegma. Should you experience an erection lasting more than four hours, seek immediate medical attention.