A gel is a solid or semisolid system of at least two constituents, consisting of a condensed mass enclosing and interpenetrated by a liquid.
Pharmaceutical gels are semisolid systems in which there is interaction between colloidal particles within a liquid vehicle.
Gels are used to achieve optimal cutaneous and percutaneous drug delivery. They can avoid gastrointestinal drug absorption difficulties caused by gastrointestinal pH. Gels are having property to avoid enzymatic activity and drug interaction with food and drinks.
There are different topical used formulation among the semisolid dosage forms gel formulations are becoming pre-eminent, Semisolid preparations usually consisting of solutions or dispersion of
one or more medicaments in suitable hydrophobic and hydrophilic bases.