Relatively speaking zopiclone has more side effects than dexzopiclone. Zopiclone and dexzopiclone belong to the same class of drugs, but dexzopiclone is the right-handed isomer of zopiclone, which has the advantages of fast absorption, rapid onset of action, strong efficacy, fewer toxic side effects, less dependence, and no rebound phenomenon or withdrawal phenomenon after stopping the drug. As a result, zopiclone has more side effects compared to dexzopiclone. The use of zopiclone may lead to adverse reactions such as malaise, headache, and irritability. The use of dexzopiclone may lead to adverse reactions such as dry mouth, headache, and dyspepsia. Both are contraindicated in people who are allergic to the product and the ingredients contained in it, patients with dyspnea dyskinesia, patients with myasthenia gravis, patients with severe sleep apnea syndrome, and others. When taking the drug, it should be taken in accordance with medical advice and the recommendations of a specialized doctor. In the event of an adverse reaction, immediate medical attention should be sought.