The action principle of Levitra is based on the drug ability to block the activity of the enzyme, which contributes to an increase in the tone of the vessels of the penis and their narrowing. Levitra administration promotes a relaxation in the smooth muscle of the corpus cavernosum vessels and dilation of arteries, which results in an increased blood flow into the penis. Filling of cavities of the cavernous bodies with blood results in an erection, which gives the man back his ability to have full sexual intercourse. Men, who are taking Levitra, should be aware of the fact that the drug does not eliminate the factors that caused sexual dysfunction and has no effect over your libido. Besides, the drug does not provide a protection against sexually transmitted infections. Therefore, if a man prefers casual sex, he should use reliable barrier methods of contraception. The information provided on Ask Pharmacy Checker is neither intended nor implied to be a substitute for professional medical advice, nor is it an endorsement of any product or service. If you are considering purchasing medication from outside the U. S., be aware that, in most circumstances, it is technically not legal for individuals to import prescription drugs; however, U. government officials have stated that individuals who order non-controlled prescription drugs from Canada or other foreign sources (up to a three-month supply) for their own use are not being pursued or prosecuted. Pharmacies listing prices on Pharmacy are required to follow Pharmacy Checker Verification Program standards and guidance policies, which permit pharmacies to internationally market, sell, process and/or dispense a maximum 3-month supply of non-controlled medication pursuant to a valid prescription authorizing a 3-month supply quantity. states, it's commonplace to dispense a year supply of a non-controlled medication; however, the quantity dispensed of Levitra is often limited by U. health insurance policies to 6 tablets every 30 days. In other words, your doctor may only prescribe 3 months at a time if you want to order through international online pharmacies. S., pharmacies have more latitude to market and sell larger quantities of medication to their customers domestically, in accordance with a written prescription. Your doctor may be able to prescribe a year supply, but, unless you are paying in cash, health insurance coverage usually does not cover a quantity that large. 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