Tag: Passive diffusion

Passive diffusion is the major process of absorption for more than 90% of drugs, driven by the simple movement of molecules across cell membranes. This energy-independent mechanism plays a critical role in determining how medications are taken up from their administration site into the bloodstream.

According to the National Institutes of Health, absorption is the first stage of pharmacokinetics, describing the movement of a drug from its administration site into the body's circulation. Understanding **what are the steps of drug absorption** is critical for explaining how medication reaches its target and produces a therapeutic effect.

The oral route is the most common way to administer medication, with approximately 85% of drugs sold in the USA and Europe taken this way. For most drugs delivered orally, the major absorption process for most drugs is passive diffusion, a critical mechanism that governs how pharmaceuticals enter the bloodstream.