The causes of stomach pain after taking medication include the adverse reaction of the drug, the stimulation of the gastric mucosa by the drug or the primary disease of gastrointestinal dysfunction, which needs to be treated after clarifying the cause of the disease, and the common measures include stopping the medication, changing the medication, and taking oral medication such as Misoprostol, Omeprazole and so on. 1. Some of the drugs will cause stomach pain after oral intake, which is a common adverse reaction of drugs and can be relieved on its own. If the symptoms are serious, it is necessary to stop or change the drugs under the advice of the doctor. 2. Part of the oral medication will stimulate the gastric mucosa after reaching the stomach, causing damage to the gastric mucosa and manifested as abdominal pain, which can be taken after meals to reduce the stimulation of the drug, or take drugs to protect the gastric mucosa such as misoprostol to improve the symptoms. 3. If the patient himself suffers from gastrointestinal dysfunction, gastritis and other diseases, there will also be the performance of abdominal pain after taking medication, you can take omeprazole to inhibit the secretion of gastric acid to relieve abdominal pain. Due to individual differences, the drug does not exist absolute safety and effectiveness, need to follow the doctor’s instructions to strictly regulate the use of adverse reactions to timely consultation, drug allergy is prohibited.