Saline laxatives

Definition

Saline laxatives are a type of laxative that work by drawing water into the intestines to soften stool and stimulate bowel movements. They are often used for rapid relief of constipation.

5 Must Know Facts For Your Next Test

1. Saline laxatives contain ions like magnesium, sulfate, citrate, or phosphate that help retain water in the intestines.
2. They typically produce bowel movements within 1 to 3 hours after ingestion.
3. Common saline laxatives include magnesium hydroxide (Milk of Magnesia) and sodium phosphate.
4. These laxatives can cause electrolyte imbalances if overused, especially in patients with kidney disease.
5. They are generally used for acute relief rather than long-term management of constipation.

Review Questions

• What is the primary mechanism by which saline laxatives induce bowel movements?
• Name two common salts found in saline laxatives.
• Why should saline laxatives be used with caution in patients with kidney disease?

Related terms

Osmotic Laxatives: Laxatives that draw water into the intestines but may use different mechanisms compared to saline laxatives.

Stool Softeners: Medications that make stool easier to pass by increasing its water content without stimulating bowel movements directly.

Stimulant Laxatives: Laxatives that induce bowel movements by stimulating intestinal muscles.