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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.
Type A: augmented pharmacological effects, which are dose-dependent and predictable [5]; Type A reactions, which constitute approximately 80% of adverse drug reactions, are usually a consequence of the drug's primary pharmacological effect (e.g., bleeding when using the anticoagulant warfarin) or a low therapeutic index of the drug (e.g., nausea from digoxin), and they are therefore predictable.
Some herbal supplements—like turmeric, cinnamon, St. John’s Wort and echinacea—can interfere with how your body processes prescription and over-the-counter medications, leading to potential ...
Two classes of diabetes drugs may also improve cardiovascular and kidney disease outcomes in people with or without diabetes. In a meta-analysis involving more than 70,000 patients with diabetes ...
Certain types of medications can make people more prone to heat-related illness. ... anticholinergics, and antipsychotics. They can cause dehydration, a lack of sweating, and problems regulating ...
When a new drug is prescribed, the risk of interactions increases exponentially. Doctors and pharmacists aim to avoid prescribing medications that interact; often, adjustments in the dose of medications need to be made to avoid interactions. For example, warfarin interacts with many medications and supplements that can cause it to lose its effect.
Part of the difficulty is identifying the source of a complaint. A headache in a patient taking medication for influenza may be caused by the underlying disease or may be an adverse effect of the treatment. In patients with end-stage cancer, death is a very likely outcome and whether the drug is the cause or a bystander is often difficult to ...
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