Adsorbent, antiflatulent, and digestive drugs

Adsorbent, antiflatulent, and digestive drugs

Adsorbent, antiflatulent, and digestive drugs are used to fight undesirable toxins, acids, and gases in the GI tract, aiding healthy GI function.

 

Adsorbent drugs

Natural and synthetic adsorbents are prescribed as antidotes for the ingestion of toxins, substances that can lead to poisoning or overdose.

 

Charcoal sketch

The most commonly used clinical adsorbent is activated charcoal, a black powder residue obtained from the distillation of various organic materials.

 

Pharmacokinetics

Activated charcoal must be administered soon after toxic ingestion because it can bind only with drugs or poisons that haven’t yet been absorbed from the GI tract.

 

Vicious cycle

After initial absorption, some poisons move back into the intestines, where they’re reabsorbed. Activated charcoal may be administered repeatedly to break this cycle.

Absorption, metabolism, and excretion

Activated charcoal, which isn’t absorbed or metabolized by the body, is excreted unchanged in stool.

 

Pharmacodynamics

Because adsorbents attract and bind to toxins in the intestine, they inhibit toxins from being absorbed by the GI tract. However, this binding doesn’t change toxic effects caused by earlier absorption of the poison.

Pharmacotherapeutics

Activated charcoal is a general-purpose antidote used for many types of acute oral poisoning. It isn’t indicated in acute poisoning from mineral acids, alkalines, cyanide, ethanol, methanol, iron, lithium, sodium chloride alkali, inorganic acids, or organic solvents. It also shouldn’t be used in a child who’s younger than age 1 year. In addition, it shouldn’t be used in a patient who has a risk of GI obstruction, perforation, or hemorrhage or decreased or absent bowel sounds, or who has had recent GI surgery.

 

Drug interactions

Activated charcoal can decrease absorption of oral medications; therefore, medications (other than those used to treat the ingested toxin) shouldn’t be taken orally within 2 hours of taking the activated charcoal. The effectiveness of activated charcoal may be decreased by vomiting induced by ipecac syrup. If both drugs are used to treat oral poisoning, activated charcoal should be used after vomiting has ceased.

 

Warning!

Adverse reactions to activated charcoal

Activated charcoal turns stools black and may cause constipation.

Teaming up

A laxative, such as sorbitol, usually is given with activated charcoal to prevent constipation and improve taste.