How long does it normally take for an impotence pill to work? Is there such thing as an herbal impotence cure, am looking for an alternative to Viagra?. If you think particular drug is causing problems with erection, tell your doctor can impotence in men be corrected and ask whether you can try different class of blood pressure medicine. The recommended dose for either Levitra or Cialis is 10 mg, and the physician may adjust this dose to 20 mg if 10 mg is insufficient. Although much less likely in adolescents, blockage of the arteries with cholesterol plaques could limit blood flow to the penis. Men who smoke risk developing impotence and the more cigarettes they smoke, the greater the risk of impotence. Lifestyle choices that contribute to heart disease and vascular problems also raise the risk of erectile dysfunction.