Dosage form is form of your drug which is dependent on the drug delivery. Dosage form can be a Solid, Liquid, Semisolid and Inhaler type. Drug delivery means we have to deliver the drug to patient in ill condition. For example, In severe nausea or vomiting like condition it is difficult to deliver drug by oral route, so for that IV route may be preferable.
Dosage form is the drug delivery system through which the drug can reach the site of absorption or action at the required potency and efficiency.
Although dosage form and drug delivery system can be used interchangeably, dosage form is often used to refer to the physical appearance of drug like tablets, capsules, syrups, ointment and creams whereas the drug delivery system is often used to refer to the way dosage form releases the drug and delivers it to the target organ, tissue, cell or even cellular organelle.
For example, OROS system of nifedipine (Procardia tablet by Pfizer)
dosage form is tablet but OROS system is the drug delivery system where the drug is released through laser drilled orifice in the semipermeable membrane either by the action of osmotic effect of KCL pushing layer or effervescent pushing layer.
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