The side effects of tinidazole include the following: 1. During the period of taking tinidazole, if a large amount of alcoholic beverages are consumed, it may cause the accumulation of acetaldehyde in the body, which prevents the oxidation of alcohol and produces a rapid reaction, resulting in abdominal cramps, nausea, vomiting, headache, agitation, etc. 2. When tinidazole is applied to treat endodontitis or gynecological diseases, adverse reactions of the nervous system can occur, such as severe headache, dizziness 3. After taking tinidazole, the stimulation and impact on the gastrointestinal tract is greater, and patients can experience nausea, vomiting, and emitting oral odor, etc. 4. Some patients are sensitive to the drug and may soon develop rash, itching, angioneurotic edema, etc., and need to stop applying the drug as soon as possible.