How do oral pills help in birth control? Name common pills used.

Explanation

### Step-by-Step Solution:

1. **Understanding Oral Contraceptive Pills (OCPs)**:
- Oral contraceptive pills, commonly known as OCPs, are medications taken by women to prevent pregnancy. They are usually taken starting within the first five days of the menstrual cycle.

2. **Dosage and Administration**:
- These pills are taken continuously for 21 days. After this period, there is a gap of 7 days during which menstruation occurs. This cycle is repeated monthly.

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