The Food and Drug Administration granted emergency authorization Wednesday to Pfizer’s COVID treatment pill, a major milestone that promises to revolutionize the fight against the virus, writes CNBC.

The medication, which is recommended for people at a high risk of developing severe COVID-19, could be available to patients as early as this weekend. Pfizer CEO Albert Bourla told CNBC earlier this month the company has already shipped some of the pills to the U.S. so they can be prescribed as soon as the FDA authorization comes through. The Centers for Disease Control and Prevention is expected to quickly follow suit with its seal of approval, authorizing its distribution.

The FDA cleared the pill for patients 12 and up with mild to moderate COVID who are most likely to end up hospitalized or not survive. The agency said it should be prescribed as soon as possible after diagnosis and within five days of symptom onset.