Difenidol is a drug for treating motion sickness such as motion sickness in cars, boats and airplanes. This drug may have the following side effects: i. Some patients may have stomach discomfort after taking the drug, including stomach distension, stomach acidity and stomach pain; ii. Some patients may experience transient hypotension, palpitations and panic; 4. Some patients may experience hallucinations, hallucinations, mental disorders and even depression after taking this drug; 5. Some patients may experience dry tongue, dry mouth, dizziness, headache, drowsiness, excessive sedation and other side effects after using this drug.