I got this from wikopedia, what do you guys think?

"Testosterone (and all the sex steroids) are metabolized by the Cytochrome P-450 enzyme system in the liver. (Specifically CYP3A.) There are certain drugs that increase or decrease the activity of this enzyme and may cause increased or decreased levels of testosterone and other sex steroids.

Cyt P-450 Inducers – May cause decreased levels of testosterone (and other sex steroid) levels: Phenobarbital and Dilantin (seizure medicines,) Rifampin (antibiotic,) and Alcohol!
Cyt P-450 Inhibitors – May cause increased levels of testosterone: Serzone, Prozac, Paxil (antidepressants,) Sporanox, D***ucan, and other ‘azole’ antifungals, Tagamet (anti-ulcer agent that can cause gynecomastia in men because of this effect.) Biaxin and other ‘erythromycin type’ antibiotics, Protease Inhibitors (HIV treatment.)