Structural Biochemistry/Ophthalmic dosage forms
It is the sterile solutions that are instilled into the eyes 2 drops at a time for each eye, the amount of time the drug makes contact with the eye is extremely short. Patients instill multiple medicated eyedrops should wait 5 minutes between instillations.
Opthalmic ointments are used for instilling into the eye. Theirs characteristic as a sterile emulsions give them the ability to stay contact with the eyes for a longer time period than ophthalmic drops.
Warning: eyesight becomes blur after usage so patients should only use this drug at bedtime only.
Medicated contact lenses:
Must be pre-soaked with medication prior to inserting into the eye; its advantages are providing controlled-release and longer contact of the drug with the eye.
Used for certain antibiotics like tetracycline and chloramphenicol.
Drug is placed in the lower eye sac between the sclera and the eyelid. Its advantages is providing a longer contact time between the drug and the eyes, control the amount of medication released into the eyes. Need to be pre-soaked prior to usage.
Reifman, Noah. Certification Review For Pharmacy Technicians. 9th ed. the United States of America: AuthorHouse, 2011. 61-88. Print.