The physician monitoring hypertension can select a drug that will have minimal effects. Marijuana is a well-known cause of fertility problems. It tends to cause hormonal problems as well as having a direct effect on the testicles. However, it is important to realize that it takes three months for the testicles to make sperm. Therefore, even after the marijuana is no longer used, it may be several months or more before those effects have been reversed.
Many drugs can have an effect on sperm production.
Sulfasalazine, a drug that is used in Crohn's disease, is well known to do this. Most hormonal supplements, including anabolic steroids, as well as other street drugs, can have an adverse effect on fertility. Antibiotics, alcohol, and tobacco all have been shown to have some effects on fertility. The success rate of vasectomy reversal is dependent upon several factors. Although the time from vasectomy is important, the experience of the surgeon performing the procedure is probably just as important.