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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.
Retards absorption of drug [3] St John's wort Tipton's weed, Klamath weed Hypericum perforatum: Antidepressants, [15] [16] warfarin, protease inhibitors for HIV, birth control, some asthma drugs, and many other medications [16]
This is a list of drugs and substances that are known or suspected to cause Stevens–Johnson syndrome This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources .
Cross-tolerance is a phenomenon that occurs when tolerance to the effects of a certain drug produces tolerance to another drug. It often happens between two drugs with similar functions or effects—for example, acting on the same cell receptor or affecting the transmission of certain neurotransmitters.
These types of medications can cause dehydration, lack of sweating, or problems with regulating body temperature, which puts people at risk for heat exhaustion and heat stroke.
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.
Medication is sometimes necessary to treat eye conditions and vision problems. Of course, this is highly dependent on the condition. Sometimes, the better option might be surgery, corrective wear ...