http://articles.mercola.com/sites/articles/archive/2008/01/02/calcium-channel-blocker-acts-as-male-contraceptive-produces-reversible-male-infertility.aspxProcardia (Nifedipine) appears to have contraceptive potential, and the calcium channel blocker also appears to cause reversible male infertility. The research stemmed from earlier observations that men who presented to infertility clinics were oftenenCommunityServer 2008.5 SP1 (Build: 31106.3070)