These tablets are used to treat men's erection. You can buy viagra 25 mg online or offline. If you buy it then don't consume it without consulting the doctor. It normally used 30 min to 1 hour before physical relation. Viagra 25 consumes an empty stomach or with any type of food. Most common side effects of these types of tablets are headaches, blurred vision, muscle pain and upset stomach. These medicines are not for use by women.if you are drinking alcohol then you don’t consume it because it might affect your body. If you are a patient of any heart disease, blood pressure, or kidney then you should advise the doctor before taking the medicine.