Drugs is a very important topic when it comes to your exam preparation for Biology and this article will provide you with some useful and relevant information regarding drugs notes for GCE O level and IGCSE. What is a Drug? According to your syllabus, a drug is a substance (chemical) which is responsible for either modifying or affecting the chemical reactions in a body. You should remember that the topic which you are studying is the " use and abuse of drugs ". This is important because there are several uses of drugs as well and we will also take a look at them. You can categorise drugs as: Medicinal drugs Socially accepted drugs Drugs of abuse Let's take a look at all these categories in detail now. Medicinal drugs These drugs are responsible for treating multiple diseases and there are various drugs that are used to alleviate (reduce) pain and even in different surgeries. The best example of medicinal drugs are antibiotics that are used to treat the ailments that
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