The word progesterone names the active hormone, but it does not list everything inside the capsule or its shell. Other ingredients can matter when someone has an allergy, a previous reaction or a specific formulation concern. A sales page describing a bioidentical hormone may leave those ingredients entirely unaddressed.
The useful starting point is an identifiable product, followed by a complete ingredient record checked with a pharmacist. This guide explains what to collect, what the current Prometrium label says and why that information cannot simply be transferred to another prescription. It does not identify a universally allergy-safe product or recommend a home test of a capsule.
In this article
Separate the active hormone from the finished formulation
Excipients are ingredients used alongside the active medicine, including materials that help form the capsule or carry its contents. Inactive does not mean irrelevant to every patient. The current Prometrium record lists progesterone separately from oils, capsule materials and color additives. A full product description answers more than the active ingredient name does.
Ask for the medicine's name, manufacturer or labeler, dosage form and strength as printed on the dispensing label. A pharmacy may also use a product identifier to locate the correct record. These details help distinguish a brand, an approved generic or a compounded preparation. They are identification details, not instructions for selecting your own strength or replacing one product with another.
Prometrium's peanut warning is explicit
The FDA's current Prometrium label lists peanut oil and states that the product is contraindicated in people allergic to peanuts. Someone with that allergy should not use Prometrium. This is more specific than a general request to watch for a reaction, and it should not be softened because the ingredient is described as inactive.
The same label identifies gelatin, glycerin, lecithin and other ingredients, with some color additives differing between the listed strengths. Our Prometrium product review follows that exact evidence. Do not treat a different capsule color, a smaller quantity or a reassuring description of the hormone as a way around the allergy restriction. Bring the issue to the prescriber and pharmacist before use.
A different product needs its own answer
A label for Prometrium establishes what that medicine contains. It does not establish that every progesterone preparation has the same ingredients, and it cannot certify another capsule as peanut-free. An absent ingredient list on a website is missing information, not evidence that an ingredient is absent from the dispensed medicine.
The FDA explains that approved generics must match their reference medicine in specified characteristics and meet approval standards. Those standards do not make a website screenshot an adequate allergy check for the product in your hand. Ask the pharmacy to identify and verify the exact formulation. Do not assume that generic means inferior, that brand means safer or that changing the active-ingredient label resolves an excipient concern.
Describe the reaction history without having to name its cause
Tell the pharmacist or clinician what happened with a previous product, including the symptoms, approximate timing and any treatment required. If you have an allergy record, share it through the appropriate care channel. You do not need to determine whether the active hormone, an excipient or something unrelated caused the event before asking for a review.
The Prometrium labeling includes hypersensitivity precautions and reports of serious allergic reactions. A suspected allergy should not be tested by opening a capsule, taking a smaller amount or trying another person's medicine. Trouble breathing, marked swelling or loss of consciousness calls for urgent medical help. This article cannot diagnose the reaction or decide which alternative, if any, would be suitable.
Compounding does not remove the need for an ingredient record
A compounded preparation can have a formulation different from a commercially manufactured capsule. That possibility does not establish that it is free of a particular ingredient, appropriate for an allergy or clinically equivalent to an approved product. Request the dispensing pharmacy's full composition information and an explanation of how it relates to the prescription and the concern being addressed.
The FDA's compounding resource explains that compounded drugs are not FDA approved and are not reviewed by FDA before marketing for safety, effectiveness and quality. The CoreAge Rx review therefore does not borrow Prometrium's formulation or approval for CoreAge's advertised compounded offer. The pharmacy's actual product details are still needed before an ingredient question can be answered.
Check a refill change rather than relying on memory
If the manufacturer, packaging or capsule appearance changes, ask the dispensing pharmacy whether it supplied the same formulation. A change does not prove an error, but it is a reasonable prompt to reconcile the label with a known allergy or prior concern. Keep the clarified product details where you can find them at the next appointment.
Also distinguish a capsule taken by mouth from another progesterone dosage form or route. Familiar hormone names do not create interchangeable instructions. Our purpose guide explains why product identity and treatment purpose belong together. If a practical problem leads the care team to propose a different preparation, ask how its ingredients, evidence and follow-up will be verified before considering the question resolved.
Make ingredient verification part of the care arrangement
Use our care-options comparison to ask who can supply the actual pharmacy record and who will respond to an allergy question. A service should be able to distinguish its marketing description from the preparation eventually dispensed. If the answer requires contacting a pharmacy, establish how that happens and how the prescriber receives the result.
Our follow-up guide helps keep any agreed change connected to the wider hormone plan. Capsule Questions gives CoreAge first commercial placement through its promotional publishing network; the placement is not a certification of ingredients or tolerability. A useful outcome is a documented answer about an identified product, with unresolved questions kept visible until the appropriate professional addresses them.
Sources for this article
Source type matters. A provider page describes an offer; an exact product label describes that medicine.
- DailyMed: Prometrium oral progesterone capsules; Acertis record updated July 23, 2026Current prescription product label · Checked 2026-09-27
- FDA: Prometrium prescribing information, revised February 2026FDA-approved prescribing information · Checked 2026-09-27
- FDA: Generic Drug FactsRegulator generic-drug approval information · Checked 2026-09-27
- FDA: Understanding the Risks of Compounded DrugsFederal regulator compounding explanation · Checked 2026-09-27