Primary microparticles and agglomerates of morphine for nasal insufflation

Area of Science:

• Pharmaceutical Technology
• Drug Delivery Systems
• Pain Management Therapeutics

Background:

• Morphine hydrochloride (HCl) is a potent analgesic typically administered via injection.
• Developing non-invasive, needle-free drug delivery systems for pain management is a significant clinical need.
• Nasal administration offers a potential alternative route for systemic drug delivery, bypassing first-pass metabolism.

Purpose of the Study:

• To characterize morphine HCl powders for nasal administration as an alternative to injection.
• To investigate the influence of spray drying and excipients on morphine powder properties and stability.
• To evaluate the efficacy of morphine agglomerates for nasal drug delivery and transport.

Main Methods:

• Morphine HCl microparticles were prepared using spray drying with various sugars as excipients.
• Spray-dried powders were agglomerated via tumbling, with some formulations including excipient microparticles.
• In vitro transport studies were conducted using rabbit nasal mucosa to assess drug permeation.

Main Results:

• Spray drying rendered morphine amorphous, affecting its stability and causing yellowing, dependent on the excipient.
• Lactose proved effective for spray-dried morphine agglomerate manufacturing and nasal delivery.
• Agglomerates of morphine crystals with mannitol/lecithin microparticles exhibited better stability but slower permeation compared to spray-dried agglomerates.

Conclusions:

• Spray-dried morphine agglomerates, particularly with lactose, facilitate efficient nasal drug delivery for pain treatment.
• Excipient selection is critical for optimizing both the stability and nasal permeation of morphine formulations.
• Nasal administration of morphine agglomerates presents a promising needle-free alternative to parenteral injection for pain relief.