Viagra is medicine for erectile dysfunction treatment. It is PDE5 (phosphodiesterase-5) inhibitor. Possible side effects are headaches, nasal congestion, diarrhea, nausea, facial flashing.
Usual dosage for Viagra is 25-100 mg taken one hour before future sex. Viagra can increase effect of blood pressure lowering medicines, so be careful. Additionally it lowering effects of angina treatment nitrates. If you are taking nitrates, do not take Viagra at the same time while you are treating angina. Because some side effects are possible.
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If you get dizzy or nauseated, while sexual intercourse, or you fill pain in your chest or other parts of your body, stop activity and call your doctor immediately. Because you can get some side effect of Viagra.
Do not use Viagra if you have such possible side effects: sudden vision loss, sudden hearing loss or ringing in your ears. Swelling of your lips, tongue, face or throat are enough reason to phone your doctor too.
Necessary precautions before you start to take Viagra includes information your doctor if you have any allergic reactions. Inform your doctor if you have any of allergies.
Inform your doctor if you have high or low blood pressure, sickle cell disease, dehydration, priapism, eye problems, heart problems, chest pain, kidney or liver disease, idiopathic hypertrophic subaortic stenosis.
Most patients should start form 50mg dose. Based on effects and toleration, the dose maybe decreased to 25mg or increased to 100mg, you should advise with your doctor. Do not take more than 1 pill per day!
If you use any nitric oxide donors or nitrates, you should not use Viagra because it increases effects of these medicines.
Additionally Viagra is co-administered with an alpha-blocker, so if you are taking such therapy you should start to use Viagra with the lowest dose and not so often.
Keep Viagra at room temperatures and out of the children reach.

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