Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available. Insurance: If you plan to use insurance, make sure the online provider accepts it. Those with a history of blood pressure or heart issues, hormonal imbalances, mental health issues, and diabetes should consult their doctor before trying PDE5 inhibitors. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil. Slowly pull back the plunger until the required dose.He or she will tell you how much VIAGRA to take and when to take it. Get into the mood. You will not get an erection just by taking VIAGRA. You must be sexually stimulated for it to work. Take your time. VIAGRA usually starts to work within minutes. You may take it up to 4 hours before sexual activity. Never take more than mg of Viagra in a hour period. Too much Viagra can cause severe headache, low blood pressure, and orthostasis (drop in blood pressure when standing) that can lead to. It depends on a few factors, including your age and why you’re taking it, since Viagra is not only used to treat ED. Your doctor will tell you how much you should take. For help with erections.