Side effects of pyrimethamine potassium eye drops in regular doses usually include conjunctival congestion, irritation, and more. Adverse reactions can also include allergic reactions, and some people sometimes experience blepharitis, eyelid dermatitis, and so on, and these symptoms should be discontinued once they occur. Other side effects have not been reported, but the absence of reports does not necessarily mean that they are not present, and they require the attention of each patient in the process of using the drug. If any intolerable adverse reactions occur during the use of the medication, it is important to stop the medication and go to the hospital in time. Pyrimethamine Potassium Eye Drops is mainly a topical, western preparation for eye drops for allergic conjunctivitis, spring catarrhal conjunctivitis. Pimelast Potassium Eye Drops is a prescription medicine that must be used in a hospital, after a standardized doctor’s consultation. The application of the drug must be under the guidance of a doctor, combined with a certain dosage, the use of the course of treatment to apply.