Adverse drug reactions refer to harmful reactions that occur under the normal dosage of qualified drugs and are not related to the purpose of medication. We often say that the main adverse reactions are as follows:
One is the side effects, which are adverse reactions that occur when the drug is commonly used and has nothing to do with the therapeutic effect. Side effects mostly lessen or disappear quickly after discontinuation.
The second is the after-effect effect, such as the long-term use of tranquilizer sedative hypnotic drugs to treat insomnia, and the feeling of lethargy caused by the next day.
The third is allergic reactions, some special reactions that occur when patients with special constitutions take drugs, mild rashes, drug fever, etc., and even severe breathing difficulties and shock.
The fourth is addiction and dependence, long-term use of morphine, codeine, etc. will make the body have serious dependence and tolerance, and withdrawal symptoms can occur after stopping the drug.