ARA-290 Research Log – Two Subjects with Neuropathy and Chronic Pain

[_220Progress]

Sharing log to document observations from two research subjects receiving ARA-290. The goal is simply to record dosing, tolerability, and any subjective or objective changes over time.
I hope this helps someone looking into ARA-290.
Please ask any questions or provide suggestions!

Compound - ARA-290

• 10 mg lyophilized vials
• Six vials from the same production batch (matching COAs and batch numbers)
• Five vials reconstituted with 2 mL phosphate-buffered saline (PBS)
• One vial reconstituted with 2 mL bacteriostatic water for comparison

Concentration (PBS):
10 mg → 2 mL = 5 mg/mL (50 mcg/µL)
100 units (1.0 mL) = 5 mg

Subject A-73-year-old male
History:

• Parkinson’s disease
• Peripheral neuropathy
• Chronic mid- and lower-back pain

Dosing Plan
Started conservatively with dose escalation.

• Day 1: 1 mg
• Days 2–4: 2 mg daily
• Day 5 onward: 4 mg daily

Subcutaneous injections using rotating abdominal sites, beginning at the left love handle and moving approximately 4 inches with each injection to avoid repeated use of the same location.
Injection Log:
6/25 -1 mg (20 units) Left love handle

6/26- 2 mg (40 units) Left lower abdomen

6/27- 2 mg (40 units) Central lower abdomen

6/28-2 mg (40 units) Central right abdomen

• Subject noted walking approximately 6 minutes before back pain began.

6/29- 4 mg (80 units)Right love handle

Early Observations

• No injection-site irritation.
• No redness, swelling, or discomfort reported.
• Dose escalation to 4 mg began June 29 and will continue for further observation.

Research Subject B 49 yo Female
History:

• Chronic neuropathic pain following ankle tendon surgery
• Chronic mid- and lower-back pain

Dosing

• Started directly at 4 mg daily.
• Initial injection administered subcutaneously in the abdomen.

Early Observations
Unlike Subject A, Subject B experienced immediate injection-site discomfort.

Reported after injections:

• Burning/“fire” sensation
• Pain during and after administration
• Raised welt at the injection site

Injection location was changed from the abdomen to the thigh for subsequent administration, but the burning sensation has continued.

At present, Subject B is considering discontinuing participation due to injection-site intolerance despite rotating injection locations.

Initial Notes

Although both subjects share neuropathy and chronic back pain, their local injection-site reactions have been markedly different despite using material from the same batch.

At this stage it is too early to comment on efficacy. Future updates will focus on:

• Neuropathic pain
• Back pain
• Mobility
• Walking tolerance
• Sleep quality
• Injection-site reactions
• Any adverse events or unexpected observations

This thread will be updated as additional data are collected.

Please share any history you have had with ARA-290 on this thread. Especially the injection site issues.

 

[hoobz]

Thank you for sharing this. Could you let me know if the vial reconned with BAC ended up with the peptide gelling? This is what happened to me (tried two vials from the same batch). I'm trying to get hold of PBS, but it's not easy to get where I live.

 

[Dos-Dox]

Did you confirm your ARA was unbuffered before using PBS? To recon with 2 mL PBS seems like a lot. I reconned with regular BAC and then tested pH and slowly added sodium bicarbonate until the solution was clear & neutral.

I'm trying to get hold of PBS, but it's not easy to get where I live.

See if you can find sodium bicarbonate. It’s typically available in 8.4% and is safe for injection. Only a small amount is needed.

 

[eidos]

Way too much data creating noise. It's like an exam.

The reaction was most likely caused by the hypotonicity of the solution. When it happens right away and there's a bump, there's pretty much no doubt about it.

Add some sterile 0.9% NaCl, and it should be fine.

It's a good idea to use PBS, as it makes a lot of things easier. Be sure to calculate the correct concentration so it's in the "goldilocks" zone.

The length of the needle is also important.

I'm going to buy some Ara this week, and I've only scanned the literature so far. To be continued.

 

[Gorby2025]

Way too much data creating noise. It's like an exam.

Completely disagree with that statement.

@_220Progress - Excellent summary and insights. Everything is factual and observational. Please keep it coming and the more the better. There is simply not enough information out there that has this level of details which is greatly appreciated. It's actually too high-level and generic posts that are useless and require a lot of follow up questions. Thanks for this and hope you can continue updating the thread in the same manner with more details. Thank you.

 

[hoobz]

Did you confirm your ARA was unbuffered before using PBS? To recon with 2 mL PBS seems like a lot. I reconned with regular BAC and then tested pH and slowly added sodium bicarbonate until the solution was clear & neutral.


See if you can find sodium bicarbonate. It’s typically available in 8.4% and is safe for injection. Only a small amount is needed.

Nope, I wasn't aware of the buffered/unbuffered versions at the time I ordered, only found out about that later. I'm waiting for the buffered one now, but still have 8 vials of unbuffered that I don't want to throw away. Sodium bicarbonate is prescription only where I live (like all solutions for injection). I will try to order PBS from a vendor I'm planning to do my first buy from, I noticed they have its available. I guess it's my best bet at this point. Thanks for your comment!

 

[eidos]

Completely disagree with that statement.

« Agree to disagree. That's what I love about science: there's no one right answer. » Zack from TBBT

 

[FLglpguy]

I ordered ARA-290 yesterday. I did not know there was a buffered or unbuffered option. Is there an efficacy difference between these? Ai clearly states that buffered is better and dissolves much better with BAC. I just texted my vendor to ask which version I will be getting.