Physical and Psychological Dangers and more info...

Possible physical side effects include the following:
High blood cholesterol levels - high blood cholesterol levels may lead to cardiovascular problems
Severe acne
Thinning of hair and baldness
Fluid retention
High blood pressure
Liver disorders (liver damage and jaundice)
Steroids can affect fetal development during pregnancy
Risk of contracting HIV and other blood-borne diseases from sharing infected needles
Sexual & reproductive disorders:
MEN - atrophy of the testicles - loss of sexual drive - diminished or decreased sperm production - breast and prostate enlargement - decreased hormone levels - sterility
WOMEN - Menstrual irregularities - infertility
Masculinizing effects including:
Facial hair -diminished breast size -permanently deepened voice, and -enlargement of the clitoris
Possible psychological disturbances include:
mood swings (including manic-like symptoms leading to violence)
impaired judgment (stemming from feelings of invincibility)
depression
nervousness
extreme irritability
delusions
hostility and aggression
Source: http://www.gdcada.org/statistics/steroids/ppd.htm