A "drug" is a chemical substance, other than a nutrient or essential dietary ingredient, that, when administered to a living organism, produces a biological effect.

Drugs are the chemical substances that affect our mental state or physical being. There are 2 main types of Drugs :

- Schedule 1 Drug

- Schedule 2 Drug

Schedule 1 Drug is a category of drugs with no medical use and furthermore, can be of very harmful effects [Including addiction]. For instance, cocaine. Schedule 2 Drug is a category of drugs with medical use, and yet with a high potential for abuse and addiction. For example, Opiates. Schedules are the classifications of drugs based on their potential for abuse and dependence, and medical utility. there are 5 schedules. The only schedule without medical utility is schedule 1, furthermore, as we go down the group, lesser the potential for abuse and dependence.

There are 3 types of Drugs :

- Psychoactive Drugs

- Therapeutic Drugs

- Combination Drugs

Psychoactive drugs is a category of drugs that influences the central nervous system. They are divided by the pharmacological effects. Common sub-types are :

- Anxiolytics [Reduces anxiety]

- Empathogen-Entactogens [Emotional States]

- Stimulants [Increase the activities on Central Nervous System]

- Depressants [Decrease the activities on Central Nervous System]

- Hallucinogens [Alter Perception]

Therapeutic Drugs is a category of drugs that is used to treat, prevent, or alleviate a medical condition or symptoms of one. There are lot of types of Therapeutic Drugs.

Combination Drugs are drugs that can be taken in one dosage with different drugs. Paxlovid: combination of nirmatrelvir and ritonavir for treatment and management of COVID-19.