The main effect of Trichostatin Nitrate Ophthalmic Gel is to shrink the pupil and reduce intraocular pressure, which can be used to treat acute angle-closure glaucoma and other diseases. Trichostatin Nitrate Ophthalmic Gel is a commonly used ophthalmic medication, which can stimulate the contraction of the pupillary sphincter inside the iris tissue to reduce the size of the pupil after application of eye drops. When suffering from acute angle-closure glaucoma, the application of Trichostatin Nitrate Ophthalmic Gel can narrow the pupil, pull open the peripheral iris tissues blocked at the angle of the atrium, and restore the smooth drainage of aqueous humor, which can reduce intraocular pressure. Adverse reactions and precautions: burning sensation, stinging and other discomforts may be experienced at the initial stage of use. This product is limited to topical ophthalmic use only; use with caution in patients with asthma and acute keratitis; to avoid systemic adverse reactions, finger pressure on the lacrimal sac area for 1~2 minutes after eye drops is required. Patients need to be examined in the hospital ophthalmology, according to the condition under the guidance of the doctor to use Trichostatin nitrate ophthalmic gel treatment, not self-medication.