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In pharmaceutical sciences, drug interactions occur when a drug's mechanism of action is affected by the concomitant administration of substances such as foods, beverages, or other drugs. A popular example of drug–food interaction is the effect of grapefruit on the metabolism of drugs .
A common drug from this example can be found is Seretide®, containing a long-acting β-2 adrenergic receptor agonist named as Salmeterol and a corticosteroid named as Fluticasone. [25] Additive interaction can also be found in combination therapy for treating hypertension.
Topics of pharmacodynamics. Pharmacodynamics (PD) is the study of the biochemical and physiologic effects of drugs (especially pharmaceutical drugs).The effects can include those manifested within animals (including humans), microorganisms, or combinations of organisms (for example, infection).
A drug combination chart designed for harm reduction by TripSit [1]. Polysubstance use or multisubstance use is the use of combinations of psychoactive substances with both legal and illegal substances.
By knowing the interaction between a certain site of a drug and a receptor, other drugs can be formulated in a way that replicates this interaction, thus producing the same therapeutic effects. Indeed, this method is used to create new drugs. It can help identify which patients are most likely to respond to treatment.
Grapefruit–drug interactions that affect the pre-systemic metabolism (i.e., the metabolism that occurs before the drug enters the blood) of drugs have a different duration of action than interactions that work by other mechanisms, such as on absorption, discussed below.
Pharmacology is the science of drugs and medications, [1] including a substance's origin, composition, pharmacokinetics, pharmacodynamics, therapeutic use, and toxicology. More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical function. [2]
Drug companies invest significant effort in designing drugs that interact specifically with particular receptors, [1] since non-specific drugs can cause more side effects. An example is the endogenous drug acetylcholine (ACh).