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Another study conducted at the University of Toronto examined the interaction of sildenafil with other drugs such as nitrates and alpha blockers. The results showed that the combined use of sildenafil with nitrates can lead to serious side effects such as hypotension (decreased blood pressure). Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity.

In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. During pregnancy, sildenafil should be used only when clearly needed. Since high blood pressure in the lungs is a serious condition that can harm both a pregnant woman and her unborn baby, do not stop this medication unless directed by your doctor.

This dosage may also be offered if you are taking other medications to reduce the chance that the medications interact. The content of this website is provided for informational use only and should not be used as a substitute for medical advice, medical treatment, or diagnosis of any disease or condition. No doctor-patient relationship is established by your use of this website.

25mg tablets (the lowest dose available) should not be cut in half. The remaining half-tablet should be wrapped in e.g. clingfilm to prevent it drying out, if not used within a few days. Some preparations of generic Viagra (sildenafil) are scored for easier division. If you have any medical questions or concerns, please talk to your healthcare provider. The articles on Health Guide are underpinned by peer-reviewed research and information drawn from medical societies and governmental agencies. However, they are not a substitute for professional medical advice, diagnosis, or treatment.

Viagra works 30 to 60 minutes after it is taken and usually remains active for 4 hours. Men should have an erectile dysfunction diagnosis from a GP before buying medication online. This is especially true if you are taking an alpha-blocker antihypertensive like doxazosin. Tamsulosin (brand name Flomax), an alpha-blocker also used to treat prostate issues (like benign prostatic hyperplasia), can have the same low blood pressure effect if taken with Viagra. The total price includes shipping fees which typically cover an entire order, making it more economical to purchase multiple medications in the same order.

But a rare side effect of Viagra tablet is swelling of your genitals, including your penis. The dose may be increased to a maximum of 100 mg or decreased to 25 mg depending on the effectiveness and side effects. Patients with liver problems or severe kidney problems should start treatment with the 25 mg dose. The recommended dose of Viagra is 50 mg taken as needed about one hour before sexual activity. If Viagra is taken with food, the onset of activity may be delayed compared with taking it without food.

After Pfizer’s patent for Viagra expired in 2013, sildenafil (the active ingredient in Viagra) was made more widely available for manufacturing by other companies. Nowadays, many manufacturers continue to make sildenafil as a blue-coloured pill, but it also comes in a variety of other shapes and colours, and is sometimes manufactured as a white pill. This is commonplace, and, as with many types of generic medication, you may find that the appearance of your pills sometimes changes each time you order them. However, don’t worry