Medications include oral, intramuscular and transdermal agents, but results vary a lot. Before you start any medication, I suggest you try a
natural approach: physical exercise + DHEA, vitamins C,D, B, E and fish oil. Make sure you're not taking any meds that may influence your hormone levels, e.g. finasteride (brand names Propecia, Proscar) for male pattern baldness. Always consult your doctor before you decide to try any new treatment or natural supplement. Good luck!