Gastrointestinal agents are medications that are used to treat conditions affecting the digestive system. These agents may work by altering the acidity level in the stomach, reducing inflammation in the gut, or promoting bowel movements.

There are several types of gastrointestinal agents, including:

1. Antacids: These medications are used to neutralize stomach acid and relieve heartburn, indigestion, and other symptoms of acid reflux.

2. Proton pump inhibitors (PPIs): These medications reduce the amount of acid produced by the stomach and are used to treat ulcers and acid reflux disease.

3. H2-receptor antagonists: These medications block the action of histamine, which stimulates acid production in the stomach, and are used to treat ulcers and acid reflux disease.

4. Motility agents: These medications help to speed up or slow down the movement of food through the digestive system, depending on the condition being treated. They can be used to treat conditions such as constipation or diarrhea.

5. Anti-inflammatory agents: These medications reduce inflammation in the gut and are used to treat conditions such as Crohn’s disease and ulcerative colitis.

6. Laxatives: These medications promote bowel movements and are used to treat constipation.

7. Antiemetics: These medications help to prevent nausea and vomiting and are often used in conjunction with chemotherapy or surgery.

8. Enzyme supplements: These medications contain enzymes that help to digest food and are often used in people with pancreatic insufficiency or other conditions that affect the production of digestive enzymes.

Gastrointestinal agents can be taken by mouth, injected or given rectally, depending on the specific medication and the condition being treated. It is important to follow the instructions provided by your healthcare provider or pharmacist when taking these medications. Possible side effects of gastrointestinal agents may include nausea, diarrhea, headache, and allergic reactions.