Drugs are substances that modify and maintain physiological functions in the body. They are classified according to their chemical structure, therapeutic effect, and mode of administration. The three main categories of drugs are: (1) those that are taken orally in the form of tablets, capsules, or powders; ...

Parenteral preparations are prepared by methods that maintain their sterility, avoiding the introduction of contaminants and microbial growth. Parenteral preparations that are in liquid form require a base to dissolve them. Water for injection is commonly used in parenteral preparations. Any other suitable ...

Oral liquids are homogeneous liquid preparations, usually a solution, an emulsion or a suspension of one or more active ingredients in a suitable liquid base. They are prepared for oral administration as such or after dilution. They may contain other substances such as suitable dispersing, solubilizing, ...