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When two drugs affect each other, it is a drug–drug interaction (DDI). The risk of a DDI increases with the number of drugs used. [1] A large share of elderly people regularly use five or more medications or supplements, with a significant risk of side-effects from drug–drug interactions. [2] Drug interactions can be of three kinds ...
If the combination of two drugs in combination therapy has an effect lower than the sum of the effects of the two drugs acting independently, also known as antagonistic effect, the drugs will seldom be prescribed together in the same therapy. Drug or chemical combinations with additive effects can cause adverse effects.
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]
Every medication has potential adverse side-effects. With every drug added, there is an additive risk of side-effects. Also, some medications have interactions with other substances, including foods, other medications, and herbal supplements. [47] 15% of older adults are potentially at risk for a major drug-drug interaction. [48]
Ciprofloxacin is weakly bound to serum proteins (20–40%). It is an inhibitor of the drug-metabolizing enzyme cytochrome P450 1A2, which leads to the potential for clinically important drug interactions with drugs metabolized by that enzyme. [5] Ciprofloxacin is about 70% available when administered orally. [3]
A noted drug interaction involves erythromycin and simvastatin, resulting in increased simvastatin levels and the potential for rhabdomyolysis. Another group of CYP3A4 substrates are drugs used for migraine such as ergotamine and dihydroergotamine ; their adverse effects may be more pronounced if erythromycin is associated.
Drug-drug interactions can occur when certain drugs are administered at the same time. Effects of this can be additive (outcome is greater than those of one individual drug), less than additive (therapeutic effects are less than those of one individual drug), or functional alterations (one drug changes how another is absorbed, distributed, and ...
Antibiotic synergy is desirable in a clinic sense for several reasons. At the patient level, the boosted antimicrobial potency provided by synergy allows the body to more rapidly clear infections, resulting in shorter courses of antibiotic therapy. [3] Shorter courses of therapy in turn reduce the effects of dose-related toxicity, if applicable ...