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Impotence is not the type of medical diagnosis anyone is looking ahead to, however when you have it, there is something you can do.
If you are taking medications for chest pain (nitrates), such as isosorbide dinitrate, isosorbide mononitrate or nitroglycerin, regardless of which develop they are available in, never ever take Sildenafil without your doctor's permission, as otherwise major safety effects are possible.