Areas of drug action, also known as active sites, are areas in which drugs bind to cells to elicit a response.
The brain is the target of antidepressant, anticonvulsant and painkilling drugs. Both intentional and unintentional effects can be seen from drug interactions. A reaction that is not related to what the drug has been taken for is known as a side-effect. In today’s world, it is becoming more common for doctors to prescribe drugs for reasons that are ‘off-label’. This is when the doctor prescribes a medication to a patient for a different purpose than it is usually used for.