Teva Pharmaceutical Company located in Pennsylvania, United States, will be adding the drug sildenafil citrate to its list of hundreds of other generic drugs. The FDA has approved this drug, which is a first-ever generic type of Viagra intended to cure erectile dysfunction in male. The Company told CBS News the drug would be available in the market as of December 11, 2017.

The Sildenafil citrate tablets, which still sell under the brand name Viagra, will come in three strengths similar to Viagra; 100 mg, 50 mg, and 25 mg. The drug will be sold in pharmacies, but you can also access it online. The Sildenafil citrate tablet is taken when needed–there is no regular outlined schedule, and a person shouldn’t take more than one pill in a day.

With the number of sales estimated at $4.3 billion in the global market, the erectile dysfunction medication is a major business as reported in 2012. It has exclusive justifications to generic sildenafil citrate for 180 days, as Teva said.

Erectile dysfunction or impotence is when a man is unable to achieve and maintain an erection in preparation for sex. There have been numerous psychological and physical causes, and although experiencing occasional erection trouble might be normal, according to Mayo Clinic experts, if the situation persists then it could be a sign of underlying health condition. The situation could also be an alarm of a heart disease and the need for treatment is undeniable.

Some of the risk factors associated with erectile dysfunction are age, being overweight, tobacco use, some treatments and other mental health conditions, drug and alcohol use, stress and medications such as antidepressants and high blood pressure drugs.

According to a report from the Johns Hopkins Bloomberg School of Public Health researchers, more than 18 million men above the age of 20 suffer erectile dysfunction in the United States