Addex Targets Chronic Cough in IPF with Novel GABAB Modulator
Chronic cough is not just annoying. In diseases like Idiopathic Pulmonary Fibrosis (IPF), it’s relentless, debilitating, and poorly managed.
Now, Addex Therapeutics is taking a different approach—one that could shift how chronic cough is treated.
Why Chronic Cough in IPF Is So Hard to Treat?
IPF patients don’t just cough more. They cough differently.
Persistent, dry cough worsens over time
Standard treatments offer limited relief
Quality of life drops significantly
Current options are blunt tools. They suppress symptoms, but often bring side effects that limit long-term use. That’s the gap Addex is trying to fill.
A New Approach: Targeting GABAB Receptors
Instead of traditional cough suppressants, Addex is focusing on the GABAB receptor pathway. Here’s the logic:
GABA is the brain’s primary inhibitory neurotransmitter
It regulates cough reflex pathways in both the brain and lungs
Activating GABAB receptors can reduce cough frequency
This isn’t theoretical. The drug Baclofen already validates the mechanism. But it comes with problems:
Sedation
Short half-life
Reduced effectiveness over time
So Addex is doing something smarter.
Allosteric Modulation: Precision Over Force
Instead of directly activating the receptor (like baclofen), Addex is using a positive allosteric modulator (PAM). That means:
It enhances the receptor’s natural response
Doesn’t overstimulate the system
Offers better selectivity and tolerability
Think of it as tuning the signal, not blasting it.
What the Preclinical Data Shows?
In a bleomycin-induced IPF cough model, the results are promising.
Key findings:
Significant reduction in cough frequency
Increased cough latency (less sensitivity)
Sustained efficacy with once-daily dosing
Improved lung pathology:
Lower Ashcroft scores
Reduced fibrotic tissue involvement
Even more important, safety held up:
No meaningful change in respiratory rate
Stable body temperature
Good tolerability over chronic dosing
This matters. Chronic cough treatments must work long-term, not just acutely.
Beyond Cough: Addex’s Broader Pipeline
Addex isn’t a one-asset story.
Their pipeline reflects a broader bet on allosteric modulation in neurological disorders:
Dipraglurant (mGlu5 NAM)
Target: brain injury recovery (stroke, TBI)
Partnership with Indivior
GABAB PAM for substance use disorders
Completed IND-enabling studies
Stake in Neurosterix LLC
M4 PAM → schizophrenia, psychosis
mGlu7 PAM → mood disorders
Investment in Stalicla
Focus: neurodevelopmental disorders
This isn’t random. It’s a platform strategy built around precision receptor modulation.
What This Means (and What It Doesn’t)?
Let’s be clear: this is preclinical data. No human efficacy data yet for chronic cough. But:
The mechanism is clinically validated
The safety profile looks clean so far
The differentiation from existing therapies is real
If this translates to humans, it could offer:
A non-sedating chronic cough treatment
Better long-term efficacy
A targeted approach for IPF patients
That’s a big “if”—but a credible one.
The Bottom Line
Chronic cough in IPF has been stuck with suboptimal treatments for years. Addex’s GABAB PAM approach offers a more refined way forward:
Mechanism-backed
Preclinically validated
Designed for chronic use
Now it comes down to clinical execution. Because in pharma, promising biology is just the entry ticket.