This may be a good option if you plan to have sex at least times a week. Make sure to research all the various names for the drug, and look up the name in Spanish. Ask your doctor if you are not sure whether any of your medications contain nitrates. John’s wort. You will also need to provide the name and address of the U.The lowest price on test1.ru for generic Cialis (tadalafil) 20 mg is $ per tablet for 88 tablets at PharmacyChecker-accredited online pharmacies. Tadalafil International Price Comparison Highlight. Lowest U.S. Pharmacy Coupon Price: $ per tablet for 90 tablets. 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. Here is a list of the most expensive drugs taken by people over 50, their average price in the U.S. and the price in Mexico. I was surprised to discover that many people come to this site for the cost of certain drugs in Mexico.