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Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
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Rational drug product design integrates knowledge of the drug’s physicochemical properties, formulation components, manufacturing techniques, and intended route of administration. Each factor influences the drug’s performance, including how it is released, absorbed, and eliminated in the body.The physicochemical properties of a drug—such as solubility, stability, and particle size—affect its compatibility with excipients and the choice of dosage form. Excipients, though...
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Post-approval, manufacturers may modify an approved new or generic drug product. Such modifications can encompass alterations in the Active Pharmaceutical Ingredient (API), manufacturing process, formulation, batch size, manufacturing site, and container closure system (FDA Guidance for Industry, April 2004). Often, a drug product may undergo multiple changes.These modifications require careful evaluation to determine their potential impact on the drug product's identity, strength, quality,...
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Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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PK–PD modeling has significantly influenced FDA regulatory decisions, particularly drug approval, dosage optimization, and labeling. These models integrate pharmacokinetics (PK) and pharmacodynamics (PD) to predict drug behavior and effects, aiding in optimizing dosing regimens and enhancing the probability of clinical trial success.One notable example is Nesiritide (Natrecor®), a recombinant human brain natriuretic peptide for treating acute decompensated congestive heart failure...
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Pharmaceutical products contain more than just the active drug; they also contain various excipients such as binders, solubilizers, stabilizers, preservatives, and other elements. In some cases, impurities or contaminants might be present. Traditionally, quality control in pharmaceuticals has primarily focused on the analysis of the active drug, often overlooking the impact of these additional components. The recent issue with heparin contamination by over-sulfated chondroitin sulfate, a...
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Patent term extensions: issues, challenges and implications for pharmaceuticals.

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Patent terms are often shortened by lengthy drug approval processes. Patent term extensions aim to compensate for this lost time, ensuring fair market exclusivity for pharmaceutical innovations globally.

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Area of Science:

  • Pharmaceutical Science
  • Intellectual Property Law
  • Regulatory Affairs

Background:

  • Standard patent terms are 20 years from filing.
  • Drug development and regulatory approval frequently exceed 10 years.
  • This significantly reduces the effective patent exclusivity period for pharmaceuticals.

Purpose of the Study:

  • To summarize issues, challenges, and implications of patent term extensions.
  • To analyze the impact of regulatory delays on pharmaceutical patent life.
  • To explore global approaches to compensating for patent term loss.

Main Methods:

  • Literature review of patent term extension policies.
  • Analysis of regulatory approval timelines for pharmaceutical products.
  • Comparative study of patent extension mechanisms across different countries.

Main Results:

  • Regulatory delays substantially erode pharmaceutical patent life.
  • Patent term extensions are implemented in many countries to address this.
  • Varying approaches and complexities exist in global patent extension systems.

Conclusions:

  • Patent term extensions are crucial for maintaining pharmaceutical market exclusivity.
  • Addressing patent term loss is vital for incentivizing drug innovation.
  • International harmonization of patent extension policies warrants further consideration.