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For the treatment of ocular keratitis acyclovir, as a highly specific inhibitor of herpes virus replication, is applied topically into the eye. The objective of this study was to design and evaluate freeze-dried, bioadhesive and biodegredable acyclovir ocular minitablets for prolonged local drug action. The sponge-like nature of the lyophilized ocular minitablets ensures rapid hydration and gelation of these tablets in the eye and thus would reduce the foreign body sensation. The polymers used were sodium carboxymethylcellulose (NaCMC), hydroxypropylmethylcellulose (HPMC), xanthan gum, chitosan and Carbopol 943P. The minitablets were evaluated for drug content, weight variation, bioadhesion, water uptake and in vitro drug release. In addition, the rheological characteristics of the polymers solutions were investigated. Rheological data revealed that all tested polymers exhibited pseudoplastic behaviour which is required to minimize interference with blinking. Drug release was found to be affected by the type and concentration of polymer. The order of sustainment was chitosan > xanthan > HPMC > Carbopol > NaCMC. Water uptake study, dissolution rate of the polymers and viscosity measurements could explain the different release profiles of the drug from the polymers. Chitosan minitablet was chosen for its significant sustained release and good bioadhesive property for in vivo study in rabbits. The tablet showed a good permeation into the cornea in comparison to the commercially available Zovirax((R)) eye ointment. In conclusion, chitosan ocular minitablets containing acyclovir could be considered as a promising sustained drug delivery system for ocular keratitis treatment.
Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
This article was published in the following journal.
Name: Drug delivery
There are only a few reports available on characterization of Propionibacterium acnes isolated from various ocular clinical specimens. We undertook this study to evaluate the role of P. acnes in ocula...
Here we report the molecular cloning and characterization of the first Tumor Necrosis Factor homologous and of its putative receptor in the marine sponge Chondrosia reniformis: chTNF and chTNFR, respe...
Herpes zoster is a disease caused by reactivation of varicella-zoster virus in sensory cranial nerves and dorsal root ganglion. Our presumption was that epidural administration of acyclovir near the v...
Controlling the concentration of drugs in pharmaceutical products is essential to patient's safety. In this study, a simple and sensitive HPLC method is developed to quantitatively analyze capsaicin i...
The conventional liquid ophthalmic delivery systems exhibit short precorneal residence time and the relative impermeability to the cornea which leads to poor ocular bioavailability.
The purpose of this study is to evaluate the episode duration of a herpes labialis recurrence in immunocompromised patients treated with ME-609 or Acyclovir.
To determine whether early treatment (with oral acyclovir) of herpes simplex virus (HSV) ulcerations of the corneal epithelium prevents progression to the blinding complications of stromal...
The purpose of this study is to test whether bar coded surgical sponges can significantly increase the safety of operations, specifically by (1) reducing discrepancies and miscounts, (2) r...
We propose to study the episode rate, duration, and quantity of HSV-2 genital shedding in patients taking standard, FDA approved, CDC recommended doses of acyclovir (400 mg PO BID) for HSV...
The purpose of this study is to determine the safety and efficacy of the Collatamp G topical gentamicin collagen sponge (gentamicin sponge) combined with standard of care (daily wound care...
Sterile, gelatin-base surgical sponge applied topically as an adjunct to hemostasis when the control of bleeding by conventional procedures is ineffective to reduce capillary ooze or is impractical. (From AMA Drug Evaluations Annual, 1994, p797)
The dioptric adjustment of the EYE (to attain maximal sharpness of retinal imagery for an object of regard) referring to the ability, to the mechanism, or to the process. Ocular accommodation is the effecting of refractive changes by changes in the shape of the CRYSTALLINE LENS. Loosely, it refers to ocular adjustments for VISION, OCULAR at various distances. (Cline et al., Dictionary of Visual Science, 4th ed)
A GUANOSINE analog that acts as an antimetabolite. Viruses are especially susceptible. Used especially against herpes.
Ocular disorders attendant upon non-ocular disease or injury.
Infection caused by the protozoan parasite TOXOPLASMA in which there is extensive connective tissue proliferation, the retina surrounding the lesions remains normal, and the ocular media remain clear. Chorioretinitis may be associated with all forms of toxoplasmosis, but is usually a late sequel of congenital toxoplasmosis. The severe ocular lesions in infants may lead to blindness.
Clinical Approvals Clinical Trials Drug Approvals Drug Delivery Drug Discovery Generics Drugs Prescription Drugs In the fields of medicine, biotechnology and pharmacology, drug discovery is the process by which drugs are dis...