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Related Concept Videos

Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Drug Delivery: Miscellaneous Routes01:22

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Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
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Dosage Regimens: Designs and Approaches01:28

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Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
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Dosage Regimens: Partial Pharmacokinetic Parameters01:01

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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Measurement of Bioavailability: Pharmacodynamic Methods01:20

Measurement of Bioavailability: Pharmacodynamic Methods

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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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Therapeutic Drug Monitoring: Drug Analysis Methods01:26

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Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood or body tissues to tailor drug therapy effectively. This monitoring is critical for managing drugs with narrow therapeutic indices like digoxin and phenytoin, ensuring they are both safe and effective. For instance, monitoring theophylline levels in asthma patients involves precision and sensitivity to adjust doses according to individual responses to therapy, ensuring efficacy and...
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Use of Rabbit Eyes in Pharmacokinetic Studies of Intraocular Drugs
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Ophthalmic drug dosage forms: characterisation and research methods.

Przemysław Baranowski1, Bożena Karolewicz1, Maciej Gajda1

  • 1Department of Drug Form Technology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland.

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Advanced ophthalmic drug delivery systems, including in situ gels and inserts, improve drug bioavailability and reduce application frequency compared to traditional eye drops. This review outlines essential in vitro and in vivo studies for evaluating these novel formulations.

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Area of Science:

  • Ophthalmology
  • Pharmaceutics
  • Drug Delivery

Background:

  • Traditional ophthalmic drug forms face challenges like rapid clearance and low bioavailability.
  • Novel drug delivery systems offer enhanced ocular penetration and sustained drug release.
  • Patient compliance is often limited by frequent administration requirements.

Purpose of the Study:

  • To review developed topical ocular drug delivery systems.
  • To highlight the advantages of advanced formulations over conventional ones.
  • To recommend in vitro and in vivo studies for evaluating ophthalmic drug forms.

Main Methods:

  • Review of existing literature on ophthalmic drug delivery systems.
  • Description of various advanced formulations: eye drops, ointments, in situ gels, inserts, multicompartment systems, and bioadhesive forms.
  • Outline of recommended in vitro and in vivo testing methodologies.

Main Results:

  • Advanced ophthalmic drug forms demonstrate increased bioavailability.
  • These systems enhance drug penetration and prolong corneal contact time.
  • Controlled drug release reduces the need for frequent administration, improving patient compliance.

Conclusions:

  • Novel ophthalmic drug delivery systems offer significant advantages for treating eye conditions.
  • Appropriate in vitro and in vivo studies are crucial for validating the efficacy and safety of these advanced forms.
  • Optimized drug delivery enhances therapeutic outcomes and patient adherence.