Drug metabolism and pharmacokinetics

Area of Science:

• Pharmacology
• Allergy and Immunology
• Drug Metabolism

Background:

• Understanding drug absorption, distribution, metabolism, and excretion (ADME) is crucial for developing effective treatments for allergic diseases.
• Traditional focus on oral administration overlooks the significance of alternative routes in allergy management.
• Extrahepatic drug metabolism and transporter roles in target tissues are increasingly recognized.

Purpose of the Study:

• To comprehensively review ADME principles in the context of allergic disease pathogenesis and therapeutic strategies.
• To emphasize the importance of diverse drug administration routes beyond oral intake.
• To discuss stereoselective ADME and introduce novel methodologies like microdosing.

Main Methods:

• Review of existing literature on drug ADME in allergic diseases.
• Analysis of pharmacokinetic data for various administration routes (oral, intranasal, cutaneous, transdermal, ocular).
• Discussion of drug-metabolizing enzymes and transporters in extrahepatic tissues.

Main Results:

• Detailed examination of ADME profiles for different administration routes, impacting drug bioavailability.
• Highlighting the role of nasal mucosa and respiratory tract in drug metabolism and disposition.
• Exploration of stereoselective differences in ADME for racemic and enantiomeric antiallergic drugs.

Conclusions:

• Optimizing drug administration routes is key to enhancing therapeutic efficacy in allergic diseases.
• Extrahepatic metabolism and transporters significantly influence antiallergic drug pharmacokinetics.
• Microdosing presents a promising future avenue for studying antiallergic drug behavior, though not yet applied.