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Knowing the shelf life of Viagra or any drug will ensure that you are using it safely. Maximum drug concentration, meaning when Viagra is most present in the bloodstream, is reached 30 minutes to two hours after taking Viagra, with one hour being the average time. Manufacturers keep stock-keeping unit numbers, and you can call them and give them this info. Other common side effects include headache, flushing, dyspepsia or bloating, abnormal vision, and stuffy nose or cold-like symptoms. An important date to look out for is the best-before date.AdEnjoy Greater Libido & Performance. Fast Express Shipping. AdBrowse & discover thousands of brands. Read customer reviews & find best sellers. Find deals and low prices on the best erection pills at It is usually two years after the indicated manufacturing date (2). That is its shelf life. However, it should be pointed out that this expiration date is only for the best .