What is the recommended length for an adult suppository?

The recommended length for an adult suppository is approximately 4 inches. This length is specifically designed to ensure that the suppository is sufficiently inserted into the rectum to facilitate effective absorption and action of the medication. A 4-inch suppository is typically long enough to bypass the anal sphincter, allowing for comfortable insertion and reducing the likelihood of expulsion.

In comparison, shorter lengths may not provide the same level of retention needed for the medication to work properly, while overly long suppositories could cause discomfort or complications during insertion. This understanding aligns with general practices in pharmaceuticals, where the delivery method and anatomical considerations play crucial roles in medication efficacy.