POSOLOGY (Greek ' Posos -HOW MUCH and logos -SCIENCE') is the science of doses .Since the optimum dose of drug to produce the desired therapeutic effect varies from person to person,therefore the doses of drug are actually expressed in the form of range.The prescribed dose is that which exert the Therapeutic effect in the majority of subject.It should be minimum for eliciting the desired therapeutic response and maximum that can be tolerated by an average subject.

Drugs cannot be used for administration in their native forms,and in order to obtain the maximum therapeutic effect, it is formulated or design in to dosage forms such as  Tablets,Capsules,Solutions,Suspension,Ointment etc.

Dosage Forms is a blend of drug component with non - drug component produced in definite physical forms,shape and size intended to be administered by a particular route of administration.These include tablets,capsules,solutions,suspension and creams.