A more thorough explanation:

A drug is a substance that can be used for different purposes. It can be used to diagnose, cure, treat, or prevent diseases. It can also be a natural or synthetic substance that changes a person's perception or consciousness. Some drugs can be addictive and cause physical dependence, while others can be dangerous and require a prescription.

• Addictive drug: Heroin and nicotine are examples of addictive drugs that can cause physical dependence and withdrawal symptoms.
• Dangerous drug: A drug that has potential for abuse or injury, such as opioids, may require a label warning that it cannot be dispensed without a prescription.
• Generic drug: A drug that contains the same active ingredient as a brand-name drug but may have different excipient substances, such as binders or capsules.
• New drug: A drug that has not been recognized as safe and effective for use under the conditions prescribed and requires approval from the Food and Drug Administration before it can be marketed.

These examples illustrate the different types of drugs and their characteristics. Addictive drugs can cause physical dependence, dangerous drugs require a prescription, generic drugs contain the same active ingredient as brand-name drugs, and new drugs require FDA approval before they can be marketed.