HISTEX 2.5 MG/5 ML SYRUP
FDA nonproprietary name: triprolidine hydrochloride
For 237 mL
Pharmacies pay
$23.97 filed
237 × $0.10114 per ML
CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-06-17 · as of 2026-10-14 · retrieved 2026-10-17
Medicare
We don’t know yet
No Medicare reference price. Part D: OpenBill did not match this NDC to a usable Medicare Part D spending row. Either Part D has none for it, or the rows that share its name could not safely be tied to it (for example, they mix units, routes or release forms, or the drug is sold over the counter, which Part D does not cover). Part B: This NDC is not in the current quarter’s Medicare Part B NDC-HCPCS crosswalk, so it has no Part B payment limit.
The spread
We don’t know yet
There is no Medicare figure to compare with, so there is no spread.
Cost-plus estimate
$32.57 estimated
$23.97 + $3.60 (15%) + $5.00 fee per fill = $32.57
This is a model, not a price any pharmacy quoted. Shipping is not included. How it is worked out
OpenBill calculation · nadac-national-average-drug-acquisition-cost-20261014.csv · NADAC eff. 2026-06-17 (file of 2026-10-14, retrieved 2026-10-17)
Open the interactive card Change the quantity, type what you were charged, and see every record in full.
What it is
HISTEX 2.5 MG/5 ML SYRUP is how the CMS NADAC file names this product. The FDA NDC Directory lists it as triprolidine hydrochloride, under the trade name “HISTEX”.
FDA gives its dosage form as syrup and its route as oral.
The labeler, the company named on the label, is Allegis Pharmaceuticals, LLC.
FDA lists no Established Pharmacologic Class for it.
The NADAC file of 2026-10-14 prices it under one NDC (National Drug Code), 28595-0802-08.
NADAC classes it as a generic drug (rate-setting class G), and marks it as sold over the counter.
What pharmacies pay
Pharmacies pay $23.97 for 237 mL (237 × $0.10114 per ML, rounded to the cent), by the CMS NADAC file of 2026-10-14; that price took effect on 2026-06-17. That is what pharmacies pay their suppliers, not what they charge you.
NADAC’s explanation codes for it: 4, carried forward from the previous file; 5, calculated based on package size.
This NDC’s NADAC was carried forward from an earlier file (NADAC explanation code 2 or 4), not newly surveyed: it took effect on 2026-06-17. The file is new; the price is not.
What NADAC measures · NADAC explanation codes · Carried-forward prices
The NDC
- 28595-0802-08 · Allegis Pharmaceuticals, LLC · $0.10114 per ML · eff. 2026-06-17 filed carried forward
Other strengths, forms and brands
1 other product in the NADAC file shares the FDA nonproprietary name triprolidine hydrochloride with HISTEX 2.5 MG/5 ML SYRUP.
| Product | Pharmacies pay per unit | Medicare per unit |
|---|---|---|
| HISTEX 2.5 MG/5 ML SYRUP this page | $0.10114 per ML filed | We don’t know yet |
| TRIPROLIDINE 0.938 MG/ML DROPS | $0.40117 per ML filed | We don’t know yet |
CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-06-17, 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17
What Medicare paid
We don’t know yet; the card above says why.
Which Medicare figure OpenBill compares · How Part D is matched · How Part B is matched
What to ask at the counter
None of these figures is your price: what you pay depends on your pharmacy, your insurance, coupons and discounts.
- What is your cash price for 237 mL? Is it lower than what I would pay through my insurance?
- It is sold over the counter, so shelf prices vary from store to store: what does it cost per unit here?
- How much is in the package I am getting? This page uses 237 mL; your package may hold a different amount.
- These are questions about price, not medical advice. Do not change or stop a medicine without talking to your prescriber or pharmacist.
Questions
- Why does this page start at 237 mL?
- NADAC prices this product per ML. The FDA NDC Directory’s package description gives 237 mL in one package for this product’s NDC (“237 mL in 1 BOTTLE (28595-802-08)”), so the card starts at one package: 237 ML. Change it to match your prescription.