Medicines and drugs. Option D Part 1. What is a drug? What is the difference between a drug and a medicine? List different types of medicines. How are new drugs developed? .
A medicine or drug is any chemical that does one or more of the following to the human body:
Tolerance refers to the body’s reduced response to a drug i.e. its therapeutic effect is less than what it is intended, usually as a result of taking the drug over a long period of time. As a result more of the drug needs to be taken to achieve the same initial physiological effect with the danger of exceeding the lethal dose.