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?if you are taking sildenafil to treat erectile dysfunction, tell your doctor if you have ever been advised by a healthcare professional to avoid sexual activity for medical reasons or if you have ever experienced chest pain during sexual activity. Sexual activity may be a strain on your heart, especially if you have heart disease. If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately and avoid sexual activity until your doctor tells you otherwise. can you buy viagra online Effects of Viagra on Vision: At single oral doses of 100 mg and 200 mg, transient dose-related impairment of color discrimination was detected using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. Subjects in the study reported this finding as difficulties in discriminating blue/green. An evaluation of visual function at doses up to twice the maximum recommended dose revealed no effects of Viagra on visual acuity, intraocular pressure, or pupillometry.Tell your doctor about all your current medicines and any you start or stop using, especially:

Nitrates: Concomitant use with nitrates and nitric oxide donors in any form is contraindicated [see Contraindications (4.1)]. If you miss a dose, you may take it when you remember but do not take more than one dose per day.

4.5 Interaction with other medicinal products and other forms of interaction viagra jelly Viagra (sildenafil) and the other drugs for erectile dysfunction,Levitra (vardenafil) and Cialis (tadalafil), work by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Nitric oxide allows the smooth muscles inside the penis to relax, promoting more blood flow to the area during sexual arousal or stimulation. Through this action, the drugs work to fix a functional problem. The use of Viagra-like drugs in women is not so straightforward and a similar treatment does not exist for women. Viagra may help women who report having difficulties with lubrication because the increase in blood flow to the female genitals would subsequently increase lubrication. However, this use is not approved by the U.S. Food and Drug Administration. In addition, in most cases the problem for women is not with physical arousal but rather a lack of sexual desire. Scientists are looking at other drugs in women with sexual dysfunction who either say they're uninterested in sex or that sex provides little pleasure. For more information, please consult with your health care provider. Michelle McDermott, PharmD ?worsening shortness of breathfrom $88.32 for 3 tablet

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Geriatrics: A starting dose of 5 mg Levitra should be considered in patients ≥ 65 years of age [see Use in Specific Populations (8.5)].Make sure that you only pay for the pills. Avoid sites that ask you for a membership fee or a processing fee on top of the cost of Viagra.

viagra dosing Hypotension when Co-administered with Alpha-blockers or Anti-hypertensivesUncommon (0.1% to 1%): Arthralgia, muscle spasm

Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.

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