"In women at high risk for breast cancer, a long-term drug treatment can cut the risk of developing the disease in half. Researchers supported by the National Institutes of Health have now identified two gene variants that may predict which wom"...
Promethazine is a phenothiazine derivative which differs structurally from the antipsychotic phenothiazines by the presence of a branched side chain and no ring substitution. It is thought that this configuration is responsible for its relative lack (1/10 that of chlorpromazine) of dopamine antagonist properties.
Promethazine is well absorbed from the gastrointestinal tract. Clinical effects are apparent within 20 minutes after oral administration and generally last four to six hours, although they may persist as long as 12 hours. Promethazine is metabolized by the liver to a variety of compounds; the sulfoxides of promethazine and N-demethylpromethazine are the predominant metabolites appearing in the urine.
Last reviewed on RxList: 6/13/2008
This monograph has been modified to include the generic and brand name in many instances.
Additional Promethazine HCl Information
Report Problems to the Food and Drug Administration
Get the latest treatment options.