Chimps in an open-air forested enclosure have spotted veterinarian Raven Jackson carrying a caddy packed with their morning's juice treats and frozen bananas. A half-dozen dark-haired chimpanzees crowd the wire metal gate and wait for her to dispense the goodies.
Codeine is a narcotic. It is a pain reliever and a cough suppressant. Promethazine is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in your body. The combination of codeine and promethazine is used to treat cold or allergy symptoms such as runny nose, sneezing, and cough.
Dextromethorphan is a cough suppressant that acts on the brain to reduce coughing. Promethazine is used to treat a runny nose, cough and sneezing due to common colds, hay fever, allergies or other breathing problems. It works like an antihistamine by blocking the effects of histamine and has a drying effect.