Viagra (sildenafil citrate) has been specially designed fort the needs of male patients that have trouble getting an erection because of psychological or physical factors that may vary from person to person. This drug is easily available online and can be purchased for a lot less money. Although some people worry about the quality of such medications, there is no need for you to worry at all. Viagra sold online is just as good as rand name Viagra, just make sure you choose the right place you can trust. You will need to watch for any side effects you may get – whether you are purchasing Viagra online or at your local pharmacy, as they can mean your treatment is not going quite as panned. The following side effects are generally mild and there is no need to worry about them: headache, back pain, memory problems, stuffy nose, warmth or redness in your face, neck, and upset stomach. More serious side effects are also possible and include vision changes, sudden vision loss, swelling in your hands, general ill feeling, ringing in your ears, irregular heartbeat, chest pain, nausea, sudden hearing loss, shortness of breath, sweating, or feeling light-headed. You will need to talk to your health care provider about them right away.