Principles of Ocular Drug Administration Quiz
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Questions and Answers

Which of the following is NOT a consideration for ocular history when using drugs for ocular examination, diagnosis, or treatment?

  • Inflammation affecting drug effectivity
  • Previous history of eye surgery (correct)
  • Current ocular conditions
  • Use of other ocular medications

What should be considered when assessing medical history for ocular drug administration?

  • Family history of diabetes
  • Drug interactions (correct)
  • Allergy to seafood
  • Previous history of glaucoma

Which type of medications may result in a cardiovascular effect when combined with Phenylephrine?

  • Antibiotics
  • Steroids
  • MAO inhibitors or tricyclic antidepressants (correct)
  • Antihistamines

What effect may be seen when combining topical steroid with a family history of primary open-angle glaucoma (POAG)?

<p>Increased intraocular pressure (IOP) (B)</p> Signup and view all the answers

Which of the following is an example of an ocular history consideration when using drugs for ocular diagnosis or treatment?

<p>Use of other ocular medications (D)</p> Signup and view all the answers

What is a potential concern when using drugs for ocular examination, diagnosis, or treatment in the presence of inflammation?

<p>Reduced drug effectivity (C)</p> Signup and view all the answers

Which component of a finished drug product is also known as an excipient?

<p>Wetting agent (D)</p> Signup and view all the answers

What is the role of a wetting agent in a finished drug product?

<p>To improve the spreadability of the drug (D)</p> Signup and view all the answers

Which component of a finished drug product functions as a preservative?

<p>Buffer (A)</p> Signup and view all the answers

What term is used to refer to the tonicity equivalent in a finished drug product?

<p>Buffer (C)</p> Signup and view all the answers

What is the major functional barrier to ocular penetration?

<p>Cornea (A)</p> Signup and view all the answers

Which part of the eye is a major source of drug metabolizing enzymes?

<p>Ciliary Body (A)</p> Signup and view all the answers

Which part of the eye serves as a depot for injected or surgically implanted drugs?

<p>Vitreous (A)</p> Signup and view all the answers

What property of drugs influences which tissues act as reservoirs versus barriers in ocular drug kinetics?

<p>Molecular properties (C)</p> Signup and view all the answers

What role does the aqueous humor play in the route of drugs in the eye?

<p>Facilitates drug distribution from the bloodstream to the anterior chamber (D)</p> Signup and view all the answers

What part of the eye prevents drug movement from blood to vitreous/retina?

<p>Retina capillaries (D)</p> Signup and view all the answers

What pH environment is more compatible with the epithelium than neutral or acidic for ophthalmic solutions?

<p>Slightly alkaline (C)</p> Signup and view all the answers

What type of drugs are resisted by healthy epithelium due to its continuous layer of plasma membrane to tear film?

<p>Hydrophilic drugs (A)</p> Signup and view all the answers

Which part of the eye serves as a reservoir for hydrophilic drugs?

<p>Stroma (B)</p> Signup and view all the answers

Which part of the eye is characterized by nonspecific or low affinity binding of lipophilic drugs?

<p>Pigment (A)</p> Signup and view all the answers

Which part of the eye is a major site of absorption and is biphasic in solubility for corneal penetration?

<p>Epithelium (B)</p> Signup and view all the answers

What property of drugs is responsible for their distribution and bioavailability in ocular drug administration?

<p>Rate of passive diffusion (C)</p> Signup and view all the answers

Which category of pregnancy drugs presents a definite fetal risk and should be avoided?

<p>Category X (C)</p> Signup and view all the answers

Which condition is a contraindication for the use of phenylephrine (especially 10%)?

<p>Thyroid disease (A)</p> Signup and view all the answers

What is the main concern regarding the use of systemic steroids in patients with diabetes mellitus?

<p>Exacerbation of diabetes (D)</p> Signup and view all the answers

Which drug is contraindicated in congestive heart disease, bradycardia, and AV block?

<p>Beta blockers (B)</p> Signup and view all the answers

According to the updated drug labeling, which category of drugs has no risk to the fetus?

<p>Category A (A)</p> Signup and view all the answers

What information does the 'Lactation' subsection of drug labeling provide?

<p>Amount of drug in breast milk (A)</p> Signup and view all the answers

Which section of the updated drug labeling includes information on pregnancy testing and contraception?

<p>Females and Males of Reproductive Potential (D)</p> Signup and view all the answers

Which drug is contraindicated in hypertension?

<p>Adrenergic agonists (phenylephrine) (A)</p> Signup and view all the answers

Which condition is a contraindication for the use of cyclopentolate?

<p>CNS disorders (A)</p> Signup and view all the answers

According to the updated drug labeling, which category of drugs presents a risk to the fetus that cannot be ruled out?

<p>Category C (A)</p> Signup and view all the answers

Which section of the updated drug labeling provides detailed information on potential risks to the developing fetus?

<p>Pregnancy (C)</p> Signup and view all the answers

What does the 'Compartment' refer to in pharmacokinetics?

<p>Region of tissue or fluid through which a drug can diffuse and equilibrate (D)</p> Signup and view all the answers

According to Fick’s first law of diffusion, what affects drug absorption?

<p>Other drugs, preservatives, infection, inflammation, neuronal control (D)</p> Signup and view all the answers

Which type of kinetics is most common in ocular drug movement?

<p>First order kinetics (D)</p> Signup and view all the answers

What is the characteristic of zero-order kinetics?

<p>Release of drug is constant over time (A)</p> Signup and view all the answers

Which vessels eliminate drugs via active transport?

<p>Retinal vessels (B)</p> Signup and view all the answers

What characterizes extended release medications compared to immediate release medications?

<p>Drug level more consistent (B)</p> Signup and view all the answers

What is the advantage of prodrugs?

<p>Better penetration (B)</p> Signup and view all the answers

What happens to dipivalyl epinephrine in the cornea?

<p>Pivalyl groups are removed by esterases, leaving epinephrine to act at receptor sites (D)</p> Signup and view all the answers

What is valacyclovir classified as?

<p>Prodrug (D)</p> Signup and view all the answers

What characterizes soft drugs?

<p>Transformed by enzymes to inactive form with fewer side effects (B)</p> Signup and view all the answers

What defines site specific drugs?

<p>Transformed into inactive metabolite shortly after entering target tissue (C)</p> Signup and view all the answers

What is the characteristic of hard drugs?

<p>Non-metabolized or if metabolized, often results in toxic products (B)</p> Signup and view all the answers

What distinguishes immediate release medications from extended release medications?

<p>Pill is formulated so drug is released slowly over time (usually 12-24 hours) (C)</p> Signup and view all the answers

What is the main characteristic of a prodrug?

<p>It is an inactive derivative of an active drug that is converted to the active drug/metabolite after tissue penetration (C)</p> Signup and view all the answers

Which type of drugs are produced/developed from living organisms or contain components of living organisms?

<p>Biologics (D)</p> Signup and view all the answers

What are monoclonal antibodies (mAB) primarily used for?

<p>Stimulating the immune system (B)</p> Signup and view all the answers

How are biosimilars named?

<p>With a distinguishing suffix without meaning and composed of 4 lowercase letters attached to the core name of the original biological (D)</p> Signup and view all the answers

What does osmolarity measure?

<p>The concentration of a solution in terms of osmoles of solutes per liter of solution (A)</p> Signup and view all the answers

What is the effect of hyperosmolar tears on the corneal epithelial cells?

<p>They attract water from the corneal epithelial cells (D)</p> Signup and view all the answers

What is the main purpose of using preservatives in drug formulations?

<p>To destroy or inhibit the multiplication of microorganisms (C)</p> Signup and view all the answers

What type of preservative is benzalkonium chloride (BAC or BAK)?

<p>Detergent (Surfactant) (A)</p> Signup and view all the answers

What is a biologic?

<p>A drug produced/developed from living organisms or containing components of living organisms (D)</p> Signup and view all the answers

What distinguishes monoclonal antibodies (mAB) from human antibodies?

<p>Monoclonal antibodies are specific for a single antigen (B)</p> Signup and view all the answers

What does osmolarity measure?

<p>The concentration of a solution in terms of osmoles of solutes per liter of solution (C)</p> Signup and view all the answers

What is the main effect of benzalkonium chloride as a preservative?

<p>Disruption of corneal cell membranes (B)</p> Signup and view all the answers

What is the main effect of chlorobutanol as a preservative?

<p>Disruption of corneal cell membranes via lipid interaction (C)</p> Signup and view all the answers

What is the main effect of polyquaternium-1 (Polyquad) as a preservative?

<p>Disruption of microbial cell membranes (B)</p> Signup and view all the answers

What is the main effect of stabilized oxychloro complex (Purite) as a preservative?

<p>Broad antimicrobial effect (bacterial, fungal, viral) (D)</p> Signup and view all the answers

What is the main effect of sodium perborate as a preservative?

<p>Alters protein synthesis within bacterial cells (B)</p> Signup and view all the answers

What is the main effect of thimerosal as a preservative?

<p>Contact sensitivity/allergic reactions (C)</p> Signup and view all the answers

What is the main effect of Sorbate (sorbic acid) as a preservative?

<p>Limited antimicrobial activity (C)</p> Signup and view all the answers

What is the main difference between benzalkonium chloride and chlorobutanol as preservatives?

<p>Chlorobutanol does not act like a surfactant (B)</p> Signup and view all the answers

What is the main difference between polyquaternium-1 (Polyquad) and stabilized oxychloro complex (Purite) as preservatives?

<p>Polyquad size affects cell interaction, while Purite dissociates into water and oxygen (C)</p> Signup and view all the answers

What is the main difference between thimerosal and sodium perborate as preservatives?

<p>Thimerosal causes contact sensitivity/allergic reactions, while sodium perborate alters protein synthesis within bacterial cells (C)</p> Signup and view all the answers

What is the main difference between sorbate (sorbic acid) and SofZia as preservatives?

<p>SofZia penetrates membrane and alters DNA, protein and lipid components, while sorbate dissociates in cytoplasm and releases protons to inhibit growth via acidification (A)</p> Signup and view all the answers

Which type of preservative causes bacterial cell death by interacting with lipid components in the cell membrane?

<p>Detergent (Surfactant) (B)</p> Signup and view all the answers

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