Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Do not keep outdated medicine or medicine no longer needed. This site is intended only for U. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. The products discussed in this site may have different product labeling in different countries. · Is Viagra prescribed in dosages of mg, mg, or mg? The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer. The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS . Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash.