For those who do not know, this medication is used to shrink an enlarged prostate in men with a condition called benign prostatic hyperplasia. It works by lowering amounts of the hormone responsible for prostate growth (dihydrotestosterone). Avodart reduces urinary blockage and improves urine flow. Yes there are some withdrawal symptoms of which you should be aware. -Sexual problems (e.g. impotence, decreased intereste in sex, decrease in the amount of ejaculation) may infrequently occur, but then go away as your body adjusts to the drug. -This medication may also cause breast enlargement or tenderness. If any of these effects persist or worsen its important to contact your doctor or pharmacist promptly. -An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash, itching, swelling, dizziness, trouble breathing. feeling apathy and unconsciousness resemling deep sleep is not a very common side effect of avodart, so i'd suggest that you contact your doctor immediately if you feel these symptoms ... hope i answered your question well .. goodluck !