Chapter 6: Ophthalmic Pharmacology Flashcards
Pharmacology
The study of the medicinal use and actions of drugs
Medications
Also called Drugs, and are chiefly used for diagnosis and treatment of diseases
Delivery Systems of Drugs:
- Topical Systems
- Injections
- Oral Systems
Topical Systems
A route of drug administration in which the medication is applied to the surface of the eye
Can be in the form of: liquids, gels, or ointments
Oral Systems
A route of drug administration in which the medication is taken by mouth
Can be in the form of: tablets, liquids, capsules, powders
EX: Diamox (used for glaucoma and IIH
Injections
A route of drug administration in which the drug is administered through a hypodermic needle
Types of injections:
1. Intravenous
2. Intramuscular
3. Periocular (around the eyeball)
4. Subcutaneous
Types of Intravitreal Injections
Corticosteroids: Trivaris, Treisence
VEGF: Lucentis, Avastin, Eyelea
Implantable Intraocular Drug Delivery Devices
A form of injectable medication where a small device that contains a store of medication is injected into the eye. Afterwards, the device will deliver steady doses of the medication, thus reducing the number of injections that the patients needs.
EX: corticosteroids (Retisert, Illuvian) and dexamethasone (Ozurdex)
Solution
A form of liquid medication where the medication is completely dissolved in an inert liquid
Pros: easy to apply, tends to not alter vision
Cons: does not last as long, patient compliance
Vehicle
The nonmedication portion of medication
Hydrophobic
Refers to the property where a substance resists or repels water
Suspension
The form of medication in which the particles of the medication are suspended in a liquid vehicle
Pros: easy to apply, tends to not alter vision
Cons: does not last as long, medication can fall to the bottom of the bottle (needs to be shaken), patient compliance
Ointment or Gel
The form of a medication where the drug is suspended or dissolved in a greasy vehicle or thickened, water-soluble matrix
Pros: stays in contact with the eye much longer
Cons: not as easy to apply, can affect vision
Systemic Drug Delivery
A route of drug administration in which the drug is delivered to the entire body through the cardiovascular system.
Can be done through Intravenous, intramuscular, or subcutaneous injections, or through oral medications
Vascular Endothelial Growth Factor (VEGF)
A protein substance that stimulates the formation of new blood vessels
Mydriasis
Increase in the pupil size that occurs artificially with the application of certain drugs or in dim lighting
Mydriatics
A drug that dilates the pupil by causing the iris dilating muscle to contract and/or paralyzing the iris sphincter muscle
Color Top: RED
Used for: examination of fundus, improving vision
Side Effects: stinging with application, headache, increased blood pressure, photophobia, Onset of Angle Closure Glaucoma
Reversal Agents
A drug that can reverse the effects of Mydriatics. NOT AVAILABLE IN THE US
EX: Rev-Eyes (Dapiprazole)
Side Effects: Stinging, redness