Tablets are a solid, unit dosage form prepared by compression using tablet compression machine.
Tablet can be defined as solid, flat or biconcave disc (also available in various shape prepared by compressing a drug or a mixture of drugs with or without suitable diluents.
About 90% of drugs are available in the form of tablets to produce a therapeutic effect when administered by the oral route. They vary in shape and differ greatly in size and weight depending on the amount of medicinal substances and the intended mode of administration.
Tablet fabrication by compression was initiated in 1843 by Brockedon. Since then the popularity of this dosage form has been increasing and today tablets remain the most popular o all the dosage forms, intended for oral use. This may be attributed in part to the availability of variety of compression machines and advances in tablet technology.