16.11: Oral Drug Delivery Systems: Introduction

Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.

Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience. Tablets and capsules provide controlled and precise dosing, while liquid and chewable forms benefit pediatric and geriatric patients with difficulty swallowing. Some formulations incorporate excipients to modify drug release profiles, sustaining drug concentrations in the bloodstream and improving therapeutic outcomes. Many oral drugs require coatings to protect against gastric acid degradation or to control their release in the gastrointestinal tract. Enteric-coated tablets prevent drug breakdown in the stomach, ensuring delivery to the intended absorption site. Sustained-release formulations provide gradual drug release, reducing dosing frequency and improving patient adherence while minimizing plasma drug level fluctuations to reduce side effects.

Advancements in pharmaceutical technology have led to novel oral drug delivery systems that enhance drug absorption and bioavailability. Nanoparticle-based formulations improve solubility and facilitate targeted delivery at absorption sites. Bioadhesive formulations use polymers that adhere to mucosal surfaces, prolong drug residence time, and enhance absorption. These innovations contribute to personalized medicine, allowing optimized drug regimens and improved patient outcomes. Oral drug delivery continues to evolve with ongoing research in formulation science, developing more effective and patient-friendly dosage forms. Emerging technologies aim to enhance drug bioavailability, reduce side effects, and improve therapeutic efficacy across diverse patient populations.

Oral drug delivery systems are widely used for their convenience, affordability, and patient adherence.

Dosage forms like coated tablets, capsules, and flavored liquids mask taste, protect drugs from degradation, enhance absorption, or modify drug release.

The choice of oral dosage form depends on drug solubility, stability, and the target absorption site in the digestive system.

Low-dose drugs, including antihypertensives, anticonvulsants, and hormones, are formulated into solid dosage forms using excipients, for precise dosing and accurate administration.

Some oral drugs require coatings to prevent stomach acid degradation or ensure modified or sustained release.

Flavored liquids and dissolvable, dispersible, or chewable tablets are formulated to ease the administration for children and elderly patients with swallowing difficulties.

Innovations in oral drug delivery include controlled-release tablets, nanoparticles, and bioadhesive formulations for improved absorption and efficacy.

Oral drug delivery continues to evolve, optimizing efficacy and patient outcomes.