P2U Viagra can be prescribed once your doctor has examined you, and has agreed to prescribe this medication. He will then look at the correct dosage. This may be based upon your age and medical history. For example, if you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose of Viagra, this is 25mg. Viagra is a medication that can be prescribed to men to treat the condition known as erectile dysfunction. Before a doctor will prescribe Viagra he will discuss with your general health and look into your health history. He will do this to endure that you are healthy enough to engage in sexual activity. He will also look at what drugs you may be taking at the moment. This is because Viagra has been known to interact with some medications. If you take any medicines that have nitrates in them, such as nitroglycerin for chest pain, you will not be prescribed Viagra.
If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25-mg dose and may limit you to a maximum single dose of 25 mg in a 48 hour period.
As with most medicines, there can be some side effects with taking Viagra. The most common side effects of Viagra though are headaches, facial flushing, and upset stomach. In rare instances men taking PDE5 inhibitors, such as Viagra, have reported a sudden decrease or loss of vision. If you experience sudden decrease or loss of vision, stop taking the Viagra and seek medical advice straight away.