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Also Tadalafil is taken every day at bedtime and does not need to be taken 40 minutes before intimacy, which was an occasionally an issue with Sildenafil. Pharmaceutical companies which produce generic copies of existing medicines do not incur the high initial research and development costs. Their medicines still need to be licensed in the countries where they are supplied, but this is not such an expensive process if the same medicine has already been licensed by another drug company. Most medicines cost a lot less to produce and market than they sell for, but the margins on generic medicines are usually much lower. Generic suppliers can undercut the more expensive brands, but their profit margins tend to be lower. Other treatments for how to get viagra on the nhs ED include topical applications, injections into the penis, and surgical devices.

Two years later, Lilly ICOS, LLC, filed a new drug application with the FDA for compound IC351 (under the tadalafil generic name, and the Cialis brand name). In May 2002, Lilly ICOS reported to the American Urological Association that clinical trial testing demonstrated that tadalafil was effective for up to 36 hours, and one year later, the FDA approved tadalafil. Tadalafil is approved as an on-demand treatment for erectile dysfunction treatment, with the usual oral dose ranging from 2.5 to 20&nbsp