Viagra,Levitra and Cialis concern new group of the medical products which principle of action consists in blocking of work of enzyme which contains in many fabrics and members of the body.
It is probable, if all these enzymes were blocked completely and for ever – that consequences of such action could be tragic.
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Fortunately, all three preparations intended for treatment ED, possess some, selectivity of action and suppress work only 2-3 versions of enzyme.
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