A few medications that can cause male fertility include:

Alpha-blockers: These are used to treat urinary problems caused by an enlarged prostate or obstructive bladder neck. If you are taking these medications, you should talk to your doctor about the potential impact on your fertility and look for other treatment options.

Antidepressants: These are prescribed to people who are depressed or anxious. These drugs, however, might induce sexual dysfunction, particularly prolonged time to ejaculate. The most commonly used antidepressants among individuals are selective serotonin reuptake inhibitors (SSRIs).

Chemotherapy medications: These are used by cancer patients. Although necessary, these drugs can significantly reduce or completely lower your sperm production.

Opioids (narcotics): These are most typically used to reduce severe pain, such as post-operative discomfort, or a broken bone. Long-term opioid use, on the other hand, may alter the signals that control testosterone production, resulting in low testosterone and a decrease in both sperm quality and quantity.

Testosterone: Testosterone replacement therapy (also known as supplementary testosterone) has a negative impact on sperm production (very low sperm concentration or complete absence of sperms). 

Ketoconazole: These medications are used to treat fungal infections, often applied as creams, ointments, or powders. When taken as a tablet, these may reduce testosterone and sperm production. 

5-alpha reductase inhibitors: These drugs are prescribed to treat hair loss and prostate enlargement. These drugs, although mild, may have an effect on sperm production.

Other medications: Other medications such as anti-epileptic medications, antiretrovirals, some antibiotics, blood pressure medications, colchicine, etc., may also affect fertility in men.