Medicine Reaction, Gas

Many nonprescription and prescription medicines and supplements can cause gas and bloating. A few examples are:

• Aspirin.
• Antacids.
• Diarrhea medicines, such as Imodium, Kaopectate, and Lomotil.
• Opioid pain medicines.
• Fiber supplements and bulking agents, such as Citrucel, Fiberall, and Metamucil.
• Multivitamins and iron pills.