| http://www.w3.org/ns/prov#value | - If you have not told your doctor or pharmacist about any of the above, tell them before you start taking Viagra.Tell your doctor or pharmacist if you are taking any other medicines, including medicines you buy without a prescription from a pharmacy, supermarket or health food shop.Do not take Viagra if you are using nitrate medicines for angina.Some medicines and Viagra may interfere with each oth
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