Sublingual Administration for Pain Control: Pharmacology, Clinical Applications and Future Directions

Area of Science:

• Pharmacology
• Drug Delivery Systems
• Pain Management

Background:

• Sublingual (SL) administration is an alternative analgesic route for rapid pain control, especially when oral or parenteral routes are limited.
• SL delivery bypasses first-pass hepatic metabolism, potentially enhancing bioavailability and speeding drug onset.
• Historically associated with opioids (fentanyl, buprenorphine, sufentanil), SL analgesia now includes other agents like ketamine and cannabinoids.

Purpose of the Study:

• To review current and emerging sublingual analgesics.
• To highlight pharmacologic mechanisms, pharmacokinetics, clinical uses, and safety profiles.
• To discuss the advantages and limitations of SL drug delivery for pain management.

Main Methods:

• Literature review of available and emerging sublingual analgesics.
• Analysis of pharmacologic properties, pharmacokinetic profiles, and clinical applications.
• Evaluation of safety considerations and therapeutic limitations.

Main Results:

• SL fentanyl is effective for breakthrough cancer pain; buprenorphine is used for chronic pain and opioid use disorder.
• SL sufentanil is used for acute pain in perioperative/emergency settings.
• Emerging SL agents include ketamine, cannabinoids, and alpha2-adrenergic agonists, showing potential for various pain types.

Conclusions:

• SL drug delivery provides noninvasive administration and rapid systemic exposure for analgesics.
• Challenges such as variable bioavailability, formulation difficulties, and adverse effects hinder broader adoption.
• Further research and comparative clinical evidence are needed to optimize SL analgesic use.