LEWISTON — A 29-year-old mother of four was arrested Thursday night and charged with possessing more than $21,000 worth of the painkiller OxyContin.

Chasity Coy was arrested on a drug-trafficking charge after police and drug agents raided her home at 20 Howe St., uncovering hundreds of OxyContin tablets and a variety of other drugs.

Arrangements for the care of Coy’s four children, ages 12, 10, 4 and 3, were made before she was taken to the county jail in Auburn, police said.

On Thursday night, Maine Drug Enforcement agents were joined by officers from Lewiston and Maine State Police as they went to Coy’s first-floor apartment with a search warrant.

MDEA Supervisor Gerry Baril said the search uncovered two plastic baggies containing a total of 268 tablets of OxyContin, 80-milligram tablets of the prescription narcotic, in Coy’s bedroom.

Baril said a glass jar containing a half-ounce of marijuana and a stack of bills totaling $1,000 were also found in the bedroom. In the kitchen, agents seized a marble mortar and pestle used to crush or powder substances such as tablets.

In the bathroom, agents seized a 2-ounce bottle of Inositol, a white powder commonly used to cut other drugs, 35 tablets of codeine and 33 tablets of Naproxen, 500-milligram tablets, Baril said. Both are narcotic painkillers.

Investigators said Coy did not have prescriptions for the OxyContin tablets and intended to sell the pills at the current street value of $1 per milligram, establishing the estimated street value at $21,440.

The charges against Coy are considered aggravated because she allegedly had 8,000 milligrams of OxyContin with intent to sell it. Coy also has a prior conviction. In 2006, she was convicted of trafficking and furnishing an illegal drug.