Which factor influences drug absorption?

The type of drug formulation is a crucial factor influencing drug absorption because it directly affects how a drug is released, dissolved, and ultimately enters the bloodstream. Different formulations—such as tablets, capsules, liquids, injectables, or transdermal patches—have varying properties that determine their absorption rates. For instance, a liquid formulation may be absorbed faster than a solid tablet because it does not need to undergo disintegration or dissolution before absorption can occur.

Additionally, the presence of certain excipients in a formulation can enhance or inhibit absorption, impacting the effectiveness of the drug. Factors such as pH, solubility, and the design of the formulation all play vital roles in how well a drug can be absorbed in the gastrointestinal tract or through other administration routes. Therefore, understanding the formulation is fundamental to predicting how quickly and effectively a drug will work in the body.