Solid tablets or gel capsules comprising acetaminophen and an agent that promotes glutathione production that mitigates adverse hepatic effects of acetaminophen. The glutathione production promoter is preferably n-acetylcysteine or other mercapto-2-amino alkyl carboxylic acid having glutathione production promoting properties. A preferred composition comprises acetaminophen (200 mg to 750 mg) and N-acetylcysteine (200 mg to 600 mg). Alternatively and/or in addition to N-acetylcysteine the composition can contain at least one of methionine and cysteine. Preferred compositions can contain at least one of an opiate (or synthetic equivalent), an antihistamine, an antiemetic, and a sedative. Physical encapsulation of the ingredients optionally with or in place of a fragrance is used to make the composition more acceptable to patients by mitigating noxious properties of the glutathione production promoter. Preferably, the compositions are prepared for patient self administration in tablet or gel capsule form wherein the patients can take the medication without the need for close oversight of a medical caregiver.