Prodrug strategies involve modifying active drugs into inactive or less active derivatives to improve their pharmacokinetic and pharmacodynamics properties. These compounds are converted into the active form in the body through enzymatic or chemical processes. Prodrug design aims to enhance solubility, stability, bioavailability, and targeted delivery. Common strategies include masking polar groups or attaching promoieties that aid in absorption or site-specific activation. Prodrugs are especially useful for improving oral or transdermal delivery. Examples include codeine (converted to morphine) and Val acyclovir (a prodrug of acyclovir). Rational prodrug design integrates knowledge of metabolism, enzyme specificity, and tissue targeting. This approach expands the therapeutic potential of existing drugs.