Quick answers
- What is Histex?
- Histex is a brand name of Triprolidine, Dextromethorphan, phenylephrine and triprolidine and Dextromethorphan hydrobromide, pseudoephedrine hydrochloride and triprolidine hydrochloride, an over-the-counter medicine. The FDA NDC Directory lists 4 Histex products in 4 strengths and forms.
- Who makes Histex?
- Allegis Pharmaceuticals, LLC lists 4 of the 4 Histex products in the FDA NDC Directory.
- Is there a generic or store brand of Histex?
- Yes. The FDA NDC Directory lists 1 other product with the same active ingredients, strength and form as a Histex product, 1 of them generic or store brands. Ask your pharmacist whether one is right for you.
- What do pharmacies pay for Histex?
- CMS lists a National Average Drug Acquisition Cost (NADAC) for 2 Histex strengths and forms (see the table below). That is what pharmacies pay to buy it, not what you pay: your price depends on your insurance and your pharmacy.
- Has Histex been recalled?
- No recall linked to Histex products (by their NDC code or label) appears in the FDA enforcement reports we use.
What Histex is
Each Histex product as listed in the FDA NDC Directory, by active ingredient, strength and form, with its official label. “Same medicine, other names” counts the other products with exactly the same active ingredients, strength and form (generic versions, store brands and other brands); inactive ingredients can differ.
Triprolidine · over-the-counter medicine
| Strength and form | Product names | Same medicine, other names | Label |
|---|---|---|---|
| triprolidine hydrochloride 1.25 mg/mL syrup (oral) | HISTEX PD Drops New Formulation | 1 product, 1 company | — |
| triprolidine hydrochloride 2.5 mg/5 mL syrup (oral) | Histex | None listed | — |
Its page quotes the Drug Facts label and lists every brand and store brand: Triprolidine →
Dextromethorphan, phenylephrine and triprolidine · over-the-counter medicine
| Strength and form | Product names | Same medicine, other names | Label |
|---|---|---|---|
| dextromethorphan hydrobromide 20 mg/5 mL · phenylephrine hydrochloride 10 mg/5 mL · triprolidine hydrochloride 2.5 mg/5 mL syrup (oral) | Histex-Dm | None listed | — |
Its page quotes the Drug Facts label and lists every brand and store brand: Dextromethorphan, phenylephrine and triprolidine →
Dextromethorphan hydrobromide, pseudoephedrine hydrochloride and triprolidine hydrochloride · over-the-counter medicine
| Strength and form | Product names | Same medicine, other names | Label |
|---|---|---|---|
| dextromethorphan hydrobromide 20 mg/5 mL · pseudoephedrine hydrochloride 30 mg/5 mL · triprolidine hydrochloride 2.5 mg/5 mL syrup (oral) | HISTEX-DM New Formulation | None listed | — |
Its page quotes the Drug Facts label and lists every brand and store brand: Dextromethorphan hydrobromide, pseudoephedrine hydrochloride and triprolidine hydrochloride →
FDA approval
Histex products are sold under an FDA over-the-counter monograph: rules that set the allowed active ingredients, strengths and label wording, so these products do not need an individual FDA approval.
What pharmacies pay (NADAC)
The National Average Drug Acquisition Cost (NADAC) is the average price U.S. retail pharmacies paid to buy one unit of a medicine (one tablet, one mL or one gram), from a monthly survey of pharmacy invoices by the Centers for Medicare & Medicaid Services (CMS). State Medicaid programs use it to pay pharmacies.
This is not the price you pay. What you pay depends on your insurance (copay or coinsurance), your pharmacy and any discounts, and pharmacies also charge for filling a prescription. Ask your pharmacist or your health plan what your price will be.
| Strength and form | Generic or brand | Pharmacies pay |
|---|---|---|
| dextromethorphan hydrobromide 20 mg/5 mL · phenylephrine hydrochloride 10 mg/5 mL · triprolidine hydrochloride 2.5 mg/5 mL syrup | Generic: Histex | $0.0760 per mL Generic of the same strength and form: $0.0760 per mL |
| triprolidine hydrochloride 2.5 mg/5 mL syrup | Generic: Histex | $0.1011 per mL Generic of the same strength and form: $0.1011 per mL |
NADAC list of November 4, 2026; these prices took effect between June 17, 2026 and October 21, 2026. Shown only where a package’s NDC code matches the NADAC list exactly, and only for that exact strength and form: nothing is averaged across strengths. Strengths and forms not listed here have no NADAC price.
Source: NADAC (National Average Drug Acquisition Cost) 2026, data.medicaid.gov (CMS) →
Companies that list Histex
The company named on the package (holder, repackager or distributor), as listed in the FDA NDC Directory, with its number of Histex products.
- Allegis Pharmaceuticals, LLC4 products
Recalls
No recall linked to Histex products (by their NDC code or label) appears in the FDA enforcement reports.
Sources
- NDC Directory (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
- Drugs@FDA (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
- Drug labeling (SPL, openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
- Drug recall enforcement reports (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 27, 2026, retrieved October 31, 2026
- NADAC (National Average Drug Acquisition Cost) 2026 — Centers for Medicare & Medicaid Services (CMS), data.medicaid.gov, list of November 4, 2026, retrieved November 7, 2026
Which names get a brand page: a name the NDC Directory lists for a medicine, held by one company (the FDA application holder, or the company named on most of its products), that is not just a description, and that is not the only product of its medicine.