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Sexual problems affect millions of males. The common sexual disorder is the inability of a male to attain or maintain erection till ejaculation. It is also called erectile dysfunction (ED). Erectile dysfunction can be treated. The treatment your GP and you choose depends on the cause of ED and your life-style. Advances in medicine have helped increase the number of ways to treat erectile dysfunction effectively. Drug therapy is one of the ways. Sidenfil (Viagra) has been developed for males suffering from sexual disorders. Two more oral medications, vardenafil (Levitra) and tadalafil (Cialis) were approved by the U.S. Food and Drug Administration in 2003. How does Viagra work? The medication relaxes the arteries of the penis, so blood flow to the organ increases. The result? More natural erections over several hours. Viagra is effective, if the man is sexually stimulated, and does not trigger an erection by just taking the tablet. Drug interactions Despite the fact that each drug has proved efficacious, none is cure-all. More than that, they may bring on problems when interacted with other drugs. Keep in mind that drug-to-drug interactions with nitrates or nitroglycerin heart drugs can bring on dangerous drop in blood pressure, which can be lethal. Dosage One Viagra tablet is taken once a day. Commonly it works within 30 minutes to 1 hour and lasts almost 4 hours. Adverse side effects Even when a medication is taken according to the prescription, adverse side effects can occur. Viagra is no exception. Beneath are some common side effects you should be fully aware of before taking the drug. The commonest adverse side effects are headaches, general ill feeling, indigestion, facial flushing and visual changes. Contraindications The drug is contraindicated in males with heart problems, physical deformities of the penis, in men predisposed to protracted erections brought on by sicklemia, plasma cell myeloma (a form of cancer), leukaemia, liver problems (in particular dangerous liver disorders), kidney problems and in people taking certain drugs used for HIV or those over 65. Deaths have occurred during sex in men using the pills..