Hydroxypropyl methylcellulose is a partial methyl and partial polyhydroxypropyl ether of cellulose. It can be dissolved in cold water to form a solution with a certain viscosity. Its properties are close to the viscoelastic substances (mainly mucin) in tears, and it can be used as artificial tears. It attaches to the surface of the eyeball through the adsorption of the polymer to simulate the effect of conjunctival mucin, improve the state of reduced eye mucin and increase the retention time of the eyeball under the state of reduced tears. This adsorption effect is independent of the viscosity of the solution, ensuring that low-viscosity solutions also have a lasting wetting effect. In addition, the corneal wetting effect is increased by reducing the contact angle of the clean corneal surface, and the stability of the precorneal tear film is improved.

Dipifoline is a prodrug of adrenaline. It has no biological activity. After entering the ocular tissue, it is hydrolyzed into adrenaline and exerts biological effects, causing mydriasis and lowering intraocular pressure. The intraocular pressure lowering effect works by reducing aqueous humor secretion and improving aqueous humor flow coefficient. After one drop of 0.1% dipifoline solution is injected into the eye, intraocular pressure begins to be lowered 30 minutes later, and the maximum effect is achieved in 1 to 2 hours, which lasts for about 10 to 12 hours. It has an additive effect when used in combination with pilocarpine or b-adrenergic receptor blockers.

This product is a broad-spectrum antibacterial agent with bactericidal effect at high concentrations. Many Rickettsia, Mycoplasma, Chlamydia, and Spirochete are sensitive to this product, while Enterococcus is resistant to it. Common clinical pathogens are seriously resistant to tetracycline, including Gram-positive bacteria such as Staphylococcus and most Enterobacteriaceae. There is cross-resistance between this product and different types of tetracyclines. The mechanism of action of this product is that the drug can specifically bind to the A position of the 30S subunit of the bacterial ribosome, inhibit the growth of the peptide chain and affect the synthesis of bacterial proteins.

This product is a chloramphenicol antibiotic. It has a broad-spectrum antimicrobial effect in vitro, including aerobic Gram-negative and Gram-positive bacteria, anaerobes, Rickettsia, spirochetes and Chlamydia. It has bactericidal effects on the following bacteria: Haemophilus influenzae, Streptococcus pneumoniae and Neisseria meningitidis. It only has antibacterial effects on the following bacteria: Staphylococcus aureus, Streptococcus pyogenes, Streptococcus viridans, Group B hemolytic Streptococcus, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Salmonella typhi, Salmonella paratyphi, Shigella, Bacteroides fragilis and other anaerobic bacteria. The following bacteria are usually resistant to chloramphenicol: Pseudomonas aeruginosa, Acinetobacter, Enterobacter, Serratia marcescens, indole-positive Proteus, methicillin-resistant Staphylococcus and Enterococcus. This product is an antibacterial agent. Chloramphenicol is fat-soluble and enters bacterial cells by diffusion, and reversibly binds to the 50S subunit of the bacterial ribosome, which blocks the growth of the peptide chain (possibly due to the inhibition of the action of transpeptidase), thereby inhibiting the formation of the peptide chain and preventing protein synthesis.

Taurine is a sulfur-containing amino acid and the main amino acid in the mature retina. This product can promote the growth and development of the retina and relieve ciliary muscle spasm. Taurine competitively binds with reducing sugars in the aqueous humor and vitreous body, preventing the protein in the vitreous body from being saccharified and oxidized.