A drug is any substance consumed that alters or influences chemical reactions within the body. 

Drugs are substances that either alleviate symptoms or treat diseases by

• Influencing cellular functions, such as by targeting specific pathways or receptors.
• Aiming to restore or maintain normal bodily function while minimizing adverse effects.

Drugs can be broadly classified into two main categories: 

Medicinal drugs:

Medicinal drugs are legally prescribed or purchased to alleviate symptoms of illness or to treat medical conditions. They are intended to improve health and well-being by targeting specific ailments. For example, medicinal drugs may be used to relieve headaches, reduce inflammation, or fight bacterial infections.

Medicinal drugs are substances prescribed or used to alleviate symptoms of illness, treat medical conditions, or maintain health. These drugs are rigorously tested for safety and efficacy and are typically regulated by government authorities to ensure their quality and proper usage.