There is no such thing as the worst side effect of Gabapentin, and the severity is related to the individual’s constitution. Side effects of Gabapentin include slurred speech, drowsiness, diarrhea, and double vision. Gabapentin is generally used as an adjunctive treatment for postherpetic neuralgia as well as epilepsy. Adverse reactions such as multiple organ hypersensitivity, tachyphylaxis, and allergy may occur after administration of the drug, such as hepatitis, myocarditis, blood abnormalities, and swelling of the throat. If it is necessary to discontinue this drug, the dosage should be reduced slowly, not immediately, and avoid operating machinery, driving, etc. during the period of use. It is contraindicated in patients who are allergic to the product or suffering from acute pancreatitis. If you want to know the side effects of gabapentin, you can go to the regular hospital to consult your doctor and use the drug under the doctor’s guidance, and it is strictly prohibited to use the drug without authorization.