Can you take injectable promethazine orally?

Answer 1

No. Don't try this.

The formula for the creation of a specific drug is different depending on how it is to be taken. Taking it a different way than intended when it was made, can result in improper absorption of the active ingredients. This can result in dosages that are too high, or that are rendered totally ineffective. There are some medicines that are intended to be given only by IV and will destroy the tissue if it leaks into the muscles. Similar serious problems can occur when taking something intended for an injection by mouth (it is not just a matter of a horrible taste). Some oral medicines are made to either use the stomach acids to help release the ingredients as soon as possible, or more slowly at the proper time and place in your digestive system for each oral drug to be most effective or least irritating to the different tissues in the alimentary canal. Others are made to be able to withstand the stomach acids and other chemicals in the digestive process and be released lower in the small intestine. You will waste your medicine at best, and have a toxic reaction or caustic damage at the worst.