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Viagra is indicated for the exclusive treatment of erectile dysfunction.

What are the dosages available for Viagra and how is the drug administered?
For most patients using Viagra for the first time, the recommended dose is – except stated otherwise by one’s doctor – to be taken approximately 1 hour before sexual activity.

However, Viagra tablets could be taken anywhere from 30 minutes to 4 hours before engaging in sexual activity. The dose could be increased to a maximum recommended dose of 100 mg or decreased to 25 mg, based on effectiveness and toleration. The maximum recommended dose is once daily.

The following factors are believed to increase the plasma levels of Sildenafil Citrate (the active ingredients in Viagra):
• Men who are older than 65
• hepatic impairment (e.g., liver cirrhosis)
• Severe impairment of the kidney
• Concomitant use of potent cytochrome P450 3A4 inhibitors (ketoconazole, itraconazole, erythromycin and saquinavir ).

Since higher plasma levels of Viagra are believed to increase both the efficiency and incidence of adverse events of the drug, a starting dose of 25 mg are normally recommended among these patients.

In a study of healthy, non-HIV infected volunteers, Ritonavir was shown to greatly increase the systemic level of sildenafil by about 11-fold increase. Based on these pharmacokinetic data, a maximum single dose of 25 mg of Viagra tablets are recommended for patients using the drug in a 48 hour period.

Viagra is contraindicated for use with nitric oxide donors or nitrates after it was shown that the magic pills potentiate the hypotensive effects of nitrates.

In addition, administration of Viagra tablets in doses above 25 mg simultaneously with an alpha-blocker could lead to symptomatic hypotension in some patients. Doses of 50 mg or 100 mg of Viagra are not to be taken within 4 hours of taking alpha-blockers. However, a 25 mg dose of Viagra tablets could be taken at any time.

Safety information on Viagra
Viagra tablets should not be taken in combination with nitrates, which are usually prescribed for chest pain, as this could lead to a sudden, unsafe drop in blood pressure.

In ensuring that you are healthy enough to engage in sexual activity, discuss your general health status with your doctor. If you experience chest pain or any other discomforts during a Viagra-induced sex, ensure to seek immediate medical help.

In the rare event of an erection lasting more than 4 hours, as with any other ED tablet, seek medical help immediately to avoid long-term injury.

Any man older than 65, or who has serious liver or renal problems, may be started on the lowest dose of 25 mg of Viagra tablets online.

Also, any patient who is taking protease inhibitors, e.g. for the treatment of HIV, may be recommended a 25-mg dose by his doctor and may even be limited to take the single dose in a 48-hour period.

It has been reported that in rare occasions, men taking PDE5 inhibitors (such as Viagra, Cialis, Revatio and Levitra) may report a sudden decrease or complete loss of vision.

Whether these events are directly related to these medicines or to other factors, have not been definitively proved.

However, if you experience sudden decrease or vision loss, it is strongly advised you discontinue taking online Viagra tablets or any PDE5 inhibitors you are using, and immediately contact your doctor.

Also, Viagra and other PDE 5 inhibitors have been implicated to cause sudden decrease or loss of hearing among people who use them.
Viagra tablets are the trademark of Pfizer, Inc., which are exclusively for the treatment of ED, and are not produced to treat any other form of sexual dysfunction.

While it is actually possible to buy Viagra tablets without prescription in the US, it is always important to be cautious when taking the wonder drug. Viagra is a very safe and a proven cure for erectile dysfunction when moderately used.

Apart from the traditional local pharmacies, the online pharmacies – the reputable ones – provide a viable option to buying real Viagra tablets.

Some of these online pharmacies provide prompt delivery of the Viagra pills ordered. Before buying Viagra tablets without prescription in the US, the following are some of the areas which you need to take into consideration.

Important information on safety
If you are using any drug that contains Nitrates – commonly found in drugs prescribed for chest pains – avoid taking Viagra tablets. Taking Viagra pills with nitrates-containing drugs can fatally reduce blood pressure. If you are using any drug that you are not sure of what it contains, it is advisable you seek the opinion of your doctor.

Also, if you have not indulged in any sexual activity in quite a while, it is always advisable you discuss your health status with your doctor before resuming the activity.

Consulting with your doctor will help to ensure that you are once again physically ready to resume your normal sexual life. In addition, also seek the advice of your doctor if you experience nausea, chest pains or any other physical discomfort while having sex.

Sex is meant to be a pleasurable experience and not a painful one.

In the very unlikely event that you experience an incident of priapism – an often painful erection that lasts for more than 4 hours – it is strongly advised that you immediately seek medical help. Prolonged erections, if left unattended to, can result in permanent injuries.

Individuals who are above the age of 65 or who are suffering from some organ problems, such as kidney or liver problems are advised to start using Viagra tablets at the lowest dosage of 25mg.

Also, patients who are taking protease inhibitors, such as anti-retroviral drugs for the treatment of HIV, are normally limited to taking the 25mg dose of Viagra pills during a 48 hour period.

Noteworthy of mention is that Viagra pills do not offer any form of protection against any sexually transmitted disease and is not a treatment for any of these diseases either.

Viagra tablets, like other drugs, may cause side effects. Common examples of side effects associated with Viagra use include headaches, upset stomach and facial flushing.

Most of these effects, however, usually go away as the effect of the drug clears from the system.

It is very important you buy Viagra tablets only from credible local or online pharmacies in the US, though, for best results.

The distinguishing features of original Viagra tablets are their diamond-shape and their blue colour. Also, they carry the name of their manufacturer, Pfizer, one side of the tablet, while the stated dose of each tablet is inscribed on the other side.

In very rare cases, men who are using Viagra tablets and the other PDe5 inhibitors have complained about experiencing a decrease in their visions.

As a precaution, any one who experiences the slightest hint of vision impairment while using Viagra tablets should discontinue using the drug and immediately see a doctor.