Prometrium vs generic: are they the same? — for the United States
Prometrium is the originator brand for the active ingredient Progesterone. Once the original patent expired, authorised generic versions of the same active ingredient became available. For most users at 100mg, 200mg, the practical question is: is the generic just as good, and what really differs?
the United States context
Authorised generics of Progesterone are typically dispensed in the United States alongside or instead of branded Prometrium. US pharmacies — both chain (CVS, Walgreens, Walmart) and independent — dispense Rx medications under state pharmacy board oversight. Pharmacist consultation is encouraged at pickup. The pharmacist applies local equivalence rules at the point of dispensing; the brand vs generic price gap in USD is usually the most decisive economic factor for ongoing use.
- Regulator
- FDA (Food and Drug Administration)
- Currency
- USD
What is the same
Authorised generics of Progesterone contain the same active substance at the same 100mg, 200mg strength as Prometrium, with regulator-required bioequivalence to the originator. Clinical effect is, on average, the same. According to the prescribing information, generics meet the same regulatory standard and can substitute for the brand in most patients.
What can differ
Differences include manufacturer, country of production, excipients, tablet appearance, packaging and price. A small minority of patients react to a specific excipient that varies between manufacturers. Price is usually significantly lower for generics — often the most decisive practical difference for chronic use.
Frequently asked questions
Is generic Progesterone as effective as Prometrium? ▾
For most users at 100mg, 200mg, yes — authorised generics of Progesterone are required to demonstrate bioequivalence to Prometrium and produce the same clinical effect on average. Some users notice no difference; a few report subjective differences that are usually due to excipients or expectation.
Why does Prometrium cost more than the generic? ▾
The price difference reflects the originator's development costs, brand recognition and marketing, plus the larger volume and competition among generic manufacturers. The active ingredient Progesterone itself is identical between brand and authorised generic at 100mg, 200mg.
Prometrium vs generic: are they the same? in other countries
- the United KingdomMHRA (Medicines and Healthcare products Regulatory Agency)
- SpainAEMPS (Agencia Española de Medicamentos y Productos Sanitarios)
- MexicoCOFEPRIS (Comisión Federal para la Protección contra Riesgos Sanitarios)
- ArgentinaANMAT (Administración Nacional de Medicamentos, Alimentos y Tecnología Médica)
- GermanyBfArM (Bundesinstitut für Arzneimittel und Medizinprodukte)
- FranceANSM (Agence nationale de sécurité du médicament et des produits de santé)
- ItalyAIFA (Agenzia Italiana del Farmaco)
- BrazilANVISA (Agência Nacional de Vigilância Sanitária)
- CanadaHealth Canada
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.