Final answer:
Inunction is the application of medications through the skin, using ointments or creams. It is particularly used for drugs that are poorly absorbed through the GI tract or require localized action on the skin.
Step-by-step explanation:
The process of 'inunction' refers to the application of a drug or medication through a topical route, generally in the form of an ointment or cream that is rubbed on the skin. Inunction is often used when a drug is not effectively absorbed through the gastrointestinal (GI) tract or requires localized action.
Topical administration of drugs is an important route and includes the use of semi-solid dosage forms such as ointments and creams. Ointments are generally thicker and greasier, making them suitable for drug delivery where an occlusive effect is desired. Creams are semi-solid emulsions which can be either oil-in-water or water-in-oil, with some releasing the drug more readily depending on their composition.
This method of administration is optimal for drugs that are not easily absorbed from the GI tract or when a localized effect is needed on the skin. It is useful for treating conditions such as superficial skin infections with specific drugs like bacitracin or polymyxin. The process of inunction ensures the drug is directly applied where it is intended to act.