Dosage forms are the means by which drug molecules are delivered to sites of action within the body. They are essential for ensuring the safe, effective, and controlled delivery of medication to achieve the desired therapeutic effect. The introduction to dosage forms encompasses a wide range of formulations designed to meet various medical needs and patient preferences. Dosage forms are broadly classified based on their physical state and route of administration. The primary classifications include solid, liquid, and semi-solid forms. Solid dosage forms include tablets, capsules, powders, and granules, which are known for their stability and convenience. Liquid dosage forms such as solutions, suspensions, and emulsions are often used for patients who have difficulty swallowing solids, providing flexibility in dosing. Semi-solid forms, including creams, ointments, and gels, are typically used for topical applications to deliver medication directly to the skin or mucous membranes. Additionally, specialized forms like aerosols and transdermal patches offer unique delivery mechanisms. Definitions of dosage forms are crucial for understanding their applications and characteristics. Tablets are solid dosage forms containing medicinal substances with or without suitable diluents. Capsules are solid forms in which the drug is enclosed within a soluble container or shell. Solutions are liquid preparations containing one or more dissolved substances. Suspensions are liquid forms containing finely divided, undissolved drug particles dispersed throughout a liquid medium. Creams are semi-solid emulsions used for external application to the skin. Ointments are semi-solid preparations intended for external application with the drug incorporated into a suitable base. Each dosage form is designed to optimize drug delivery, stability, and patient compliance, ensuring effective treatment outcomes.