C-Nac Eye Drop is to be used only in the affected eye. Use it in the dose and duration as advised by the doctor. Read the label carefully for instruction before you use the medicine. Wash your hands before using this medicine. Do not use too much or too little. Use it in the exact dose as prescribed by the doctor or as instructed in the label.

Use of this medicine may cause application site reactions such as burning sensations, itching, irritation, and redness. However, these are usually temporary and resolve by themselves. In case of accidental contact with your ears, nose, or mouth, immediately rinse it with water.
Inform your doctor if you have a known allergy to any of the ingredients in this medicine or if you are taking any other medication. It is advised not to drive or operate heavy machinery immediately after using this medicine, as it may cause temporary blurring of vision and may affect your ability to drive.