Drug interactions

Drug interactions

Three kinds of interactions between drugs can occur: Pharmaceutical interactions take place between drugs before administration. For example, a precipitate can be formed when two drugs are mixed in a solution (i.e. phosphates and calcium). Pharmacokinetic interactions take place when one drug alters

the kinetics of another drug (ciprofloxacin inhibits the metabolism of coumarins). Pharmacodynamic interactions usually take place at the level of receptors and are thus molecular interactions in a physiological perspective (propranolol inhibits the effectiveness of salbutamol in asthma).

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