Do you need a prescription for Viagra?

Nowadays you can buy Viagra online or even over the counter without a prescription (depends on the country though). However, a prescription from your doctor is desirable. It’s advisable to consult the doctor because your body may react to some of the components in Viagra. The doctor can advise on the right dosage in your particular case. It’s also important because Viagra can cause some side effects and affect the working of other drugs like medicine with nitrates, some types of oral antifungal, medicines called alpha-blockers among others.