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To qualify for any form of patent in the US, an inventor must file a patent application with the PTO – an agency within the Department of Commerce – which is expected to be in three parts.

The first is the ‘specification part’, which generally describes the invention. The second is the ‘claims part’, which provides a more detailed statements explaining clearly how the invention works or is assembled. The third is the ‘drawings part’ that gives an illustrative framework of the invention.

Any inventor seeking to get a patent for his invention would need to hire a patent lawyer or a specially qualified professional called a patent agent to help guide him or her with the preparation of the application.
An official at the PTO, known as a patent examiner, would then review the application to determine if it qualifies for a patent.

This goes without saying that the applicant cannot receive any patent rights until the PTO approves and issues the patent.

It is expected that the patent examiner could ask the applicant to answer various questions about his or her invention, during the patent examination process.

By law, an applicant for patent is required to disclose all relevant information in his or her possession before the patent could be issued.
An important factor that the PTO would have to consider before granting an approval for any patent is the usefulness of an invention.

What this means is that no patent will be granted for any invention that is deemed only useful for illegal or immoral purpose.

In the pre-Viagra era, the existing treatments for ED were crude and often inconvenient to their users. However, satisfying the often time-consuming and cost-prohibitive procedures to get a patent for Viagra means that the introduction of the magic pills not only met the need for an invention to be useful, but also satisfied the unambiguous condition of how Viagra works.

Not only was the mechanism of action of Viagra delineated to get a patent for it, but the conditions under which the diamond-shaped pills should be taken were also fully explained.

Any one who is using any medicines that contain nitrates (e.g. nitroglycerin for chest pain) is strongly advised against taking Viagra tablets.

Also, before engaging in sexual activity, one is expected to discuss one’s general health status with his doctor to ensure that he is healthy enough.

After taking Viagra, and you experience nausea, chest pain, or any other discomforts during sex, seek medical help immediately.

Although erections that last for more than 4 hours could be a rare possibility with Viagra and the other ED treatments in the Viagra class, it is important to seek immediate medical help to avoid long-term injuries.

Also, men who are above 65, or men who have serious liver or kidney problems, could be started at the lowest dose of 25 mg of Viagra tablets.

People who are taking protease inhibitors –such as treatment for HIV – could be limited to a recommended dose of 25-mg dose in a 48-hour period to boot.

Viagra tablets online are not to be normally taken in combination with medications for high blood pressure such as alpha blockers, and when taken, are to be taken about four apart. In addition, patients who have prostate problems could be started you on a lower dose of Viagra.

Common side effects of online Viagra tablets are facial flushing, headache and upset stomach. Less common ones include bluish vision, blurred vision, or sensitivity to light.