PISCATAWAY, N.J. — Camber Pharmaceuticals Inc. has launched entecavir tablets, an antiviral medication.

Camber said Friday that its entecavir product is available in 30- and 90-count bottle for the 0.5-mg strength and in 30-count bottles for the 1-mg dosage.

The drug is a generic version of Baraclude tablets (entecavir) from Bristol-Myers Squibb Co. The product has annual sales exceeding $300 million.

Entecavir is indicated for the treatment of chronic hepatitis B.