Drugs like LSD, barbiturates, amphetamines, etc., are used as medicines to help patients with mental illness. However, excessive doses and abusive usage are harmful. Enumerate the major adverse effects of such drugs in humans.

Explanation

### Step-by-Step Text Solution:

1. **Introduction to the Drugs**:
- LSD, barbiturates, and amphetamines are drugs that are sometimes prescribed to help patients with mental illnesses. They can be beneficial when used correctly under medical supervision.

2. **Risks of Excessive Doses**:
- While these drugs can be helpful, excessive doses and abusive usage can lead to significant health risks and adverse effects.

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