There are prescribed dosage of Natural Viagra such as 25mg, 50 mg, and 100mg. It is said that if a person using it for the first time he can use 25mg once a day and if the health is better and can tolerate can have 50mg. but it can only be taken after the supervision of your physician, as it may lower the risk of any serious problem. There are few mild side effects of Natural Viagra, which should be known before taking it such as headache, upset stomach, facial flush, stuffy nose, allergy, rashes, blurred vision, temporary vision loss, and sometimes problem in identifying colors green and blue. Therefore Viagra is a pill to cure erectile problem in men and is a perfect solution for people who are depressed and shy.