Several factors affect a pill’s absorption rate, including design, manufacturing, physical and chemical properties, ingredients, storage, and the body composition of the person taking the drug. Based on these characteristics, pills dissolve at different speeds, according to About.com.
The digestion process begins when the pill is taken orally. Pills are actually manufactured to dissolve at specific speeds, according to About.com. Some release the medication immediately, while others are formulated to discharge it over time. Anything that has been added to the pill can affect how quickly the drug is digested, according to Merck Manuals. Liquid-filled pills dissolve more rapidly than those filled with solid materials. Additionally, some foods can aid or hinder this absorption.