Cialis (on-demand) takes the same amount of time to work as Viagra, but will last for much longer – up to 36 hours. This means that timing your ED medication is much easier. This means that timing your ED medication is much easier. Before starting treatment with this erectile dysfunction drug, it's important to understand when you should take Viagra and how much to take. Viagra can be taken at any time during the day. However, you should not take it more than once daily. IMPORTANT SAFETY INFORMATION. Do not take VIAGRA (sildenafil citrate) if you: take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary hypertension. We provide full service adult How Much Time Before Viagra Should Be Taken in a meticulously clean environment with state-of-the-art equipment. Dr. How long before sex it should be taken. How long it lasts for. How often it can be taken. How it works. What you need to do to help it work at its best. How the different versions, standard and daily, work. Generally Viagra requires 30-60 minutes to take effect, therefore take Viagra at least one hour before you intend to have sex. However the length of time Viagra takes to work can be affected by food, alcohol and sexual stimulation. Clinically speaking, you should take VIAGRA about one hour before you plan to have sex. If you take VIAGRA after a high-fat meal (such as a cheeseburger and french fries), the medicine may take a little longer to start working. You will have to experiment on what your additional timeframe is after a meal. I hope you know how to use the additional time. Best Answer: it takes one hour before viagra starts to act. Viagra should be ingested 30 to 60 minutes before engaging in sexual activity, to give the drug ample time to take effect. When taking Viagra, avoid alcohol and make sure to take the pill on a relatively empty stomach. Additionally, don’t expect immediate results; Viagra just tells your erection it’s time to get work. You’ll need to wake it up the old fashioned way. I came across some Viagra 100 Mg how much should I take for the fist time im 42 and was looking for some more fun with wife also can she take viagra.