Choosing an appropriate dosage form can enhance the therapeutic effect of a drug. Different dosage forms of the same drug may have different effects and uses. For example, magnesium sulfate solution can be used orally as a laxative, while intravenously it can be used as an anticonvulsant and sedative.
Dosage form can regulate the rate of drug action: drugs can be formulated into different dosage forms according to clinical needs.
For example, injections, aerosols, and sublingual tablets can be used for emergency treatment and have a rapid onset of action.
Sustained-release tablets and transdermal patches can prolong the duration of action and exert a sustained and effective therapeutic effect.