The most important thing is dizziness and lethargy, so it is required to work at high altitude. Drivers and passengers should use it carefully, and it is recommended to use it at night.
All these drugs have side effects (dizziness, drowsiness), among which the side effects are relatively small, such as cillamine, which is more expensive. Generally, there are 1 box of antiallergic drugs around 20 yuan (such drugs are called antihistamines), which have little side effects of sleepiness; The cheapest are classic drugs such as cyproheptadine, chlorpheniramine and aminophenol.