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Drug Classes and Categories01:25

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Drugs can be classified according to their chemical composition or their intended therapeutic application. For instance, anti-infective agents that possess the ability to eliminate pathogens or suppress their growth and reproduction can be grouped based on the organisms they target or their chemical structure. Furthermore, drugs can be divided into prescription, nonprescription, or controlled substances. Prescription medications, such as antibiotics, require oversight from a licensed healthcare...
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Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
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Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
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Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood at designated intervals to ensure the drug concentration stays within a therapeutic range. This monitoring is crucial for optimizing individual dosage regimens, enhancing therapeutic efficacy, and minimizing drug-related toxicity. TDM is vital for drugs with narrow therapeutic windows, significant variability in pharmacokinetics, and a clear correlation between plasma levels and...
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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Ophthalmic Drug Delivery Systems01:23

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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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A science based approach to topical drug classification system (TCS).

Vinod P Shah1, Avraham Yacobi2, Flavian Ştefan Rădulescu3

  • 1Pharmaceutical Consultant, North Potomac, MD, USA.

International Journal of Pharmaceutics
|June 14, 2015
PubMed
Summary

A new Topical Drug Classification System (TCS) is proposed for topical products, building on the success of the Biopharmaceutics Classification System (BCS). This system aids in regulatory approval by considering excipient similarity and formulation characteristics.

Keywords:
BioequivalenceBiowaiverIn vitro releaseSUPAC-SSTopical dosage formsTopical drug classification system

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Regulatory Science

Background:

  • The Biopharmaceutics Classification System (BCS) has successfully guided oral drug product development and regulation.
  • Topical drug products require a similar science-based classification system for efficient development and approval.
  • Current generic topical products in the US often match reference listed drugs (RLDs) in excipient composition (Q1, Q2).

Purpose of the Study:

  • To develop a Topical Drug Classification System (TCS) for topical drug products.
  • To establish a framework for classifying topical formulations based on scientific principles.
  • To determine conditions under which biowaivers may be granted for topical products.

Main Methods:

  • Consideration of qualitative (Q1) and quantitative (Q2) excipient similarity to RLDs.
  • Inclusion of in vitro release (IVR) and in vitro characterization data.
  • Assessment of the arrangement of matter and microstructure (Q3) of topical formulations (suspensions, creams, ointments, gels).

Main Results:

  • A novel Topical Drug Classification System (TCS) is proposed.
  • The TCS categorizes topical formulations into four distinct classes.
  • The system facilitates decisions regarding the potential for biowaivers based on formulation characteristics.

Conclusions:

  • The proposed Topical Drug Classification System (TCS) offers a scientific basis for evaluating topical drug products.
  • Implementation of TCS can streamline the development and regulatory review of generic topical medications.
  • The system supports the use of in vitro data for regulatory decision-making, potentially enabling biowaivers.