Keflex is the historical U.S. brand name for cephalexin, an oral first-generation cephalosporin antibiotic used for certain susceptible bacterial infections. The name remains common in medical records and search queries, but a brand reference is not an offer to buy an active branded product. FDA Orange Book records place the original Keflex capsule presentations in the discontinued-drug section.
The practical modern pharmacy question is which approved generic cephalexin formulation matches a valid prescription. This page explains the brand’s identity, its historical dosage-form record and the appropriate steps for verifying generic alternatives. If you want a direct ingredient comparison, open Keflex versus cephalexin; for the current generic category, use generic cephalexin products.
Cephalexin remains prescription-only, and product availability varies among pharmacies. A label, former strength or historical drug database entry does not verify shelf stock today. Never substitute a different antibiotic or a legacy brand presentation without pharmacist and prescriber involvement.
Keflex was a proprietary name associated with cephalexin. The historical brand and modern generic products share the cephalexin active ingredient, but an FDA-approved generic is identified by its own application, manufacturer or labeler and specific presentation.
The distinction matters when a patient sees “Keflex” in a medical history but a pharmacy label says “cephalexin.” The brand name can communicate the intended molecule without proving that an original-brand package was dispensed.
| Your next question | Relevant Core guide | What it covers |
|---|---|---|
| Is Keflex the same ingredient | Brand comparison | Understand active ingredient identity |
| Need a current product | Generic products | Review present-day approved category |
| Need capsule forms | Capsule formats | Compare labeled generic strengths |
| Need the application record | Manufacturer index | Interpret FDA and DailyMed roles |
| Need prescription access | Prescription guide | Verify a lawful pharmacy pathway |
The FDA Orange Book lists original Keflex oral capsule strengths under discontinued drug products. This is a regulatory and marketing-status record, not evidence that cephalexin itself was withdrawn for safety reasons or that all generic capsules vanished.
When reviewing the Orange Book, distinguish discontinued product listings from withdrawal of approval for safety or effectiveness and from currently approved multisource cephalexin products. Do not interpret an old brand listing as a live pharmacy catalog.
The FDA discontinued-drug list can include products discontinued from marketing for reasons other than safety or effectiveness. Therefore, an entry under that heading should not be shortened to “the antibiotic was banned.” Cephalexin generic approvals and labels must be examined separately when describing what is available for modern prescription use.
Keflex capsule entries include historical strengths that are not necessarily part of ordinary current generic retail presentations. Search results mentioning 333 mg or 750 mg can be technically relevant to the brand history but do not mean those exact branded packages can be purchased.
For contemporary product matching, start with the cephalexin forms hub and have a pharmacist verify the active product and quantity on the prescription.
Product references to Keflex 250 mg, 333 mg, 500 mg and 750 mg may stem from different periods of brand marketing. They should be interpreted as historical FDA capsule entries, not a current menu to offer shoppers. A modern generic prescription usually needs a more specific conversation about documented available strengths and the relevant dose form.
Cephalexin is a beta-lactam cephalosporin antibacterial agent; its use depends on a susceptible bacterial organism and the clinical infection type. A familiar brand name is not a diagnosis or justification for self-treatment.
The current U.S. generic labeling addresses specified respiratory, ear, skin and skin-structure, bone, and genitourinary infections. A prescriber must consider medical history, allergy and bacterial susceptibility. Learn about prescription access before any dispensing decision.
FDA approval and therapeutic-equivalence evaluations address defined product criteria, not identical pill color or packaging artwork. Generic capsules can look different from a historical Keflex capsule while containing cephalexin at the prescribed strength.
The pharmacist should check the exact form, active ingredient and applicable substitution rules. The generic substitution guide addresses the practical process without implying that all strengths and forms may be exchanged.
Cephalexin is available under generic product labels in capsule and oral-suspension forms, with certain tablet products represented in regulatory records. Product availability depends on the particular item and date, and a database record is not inventory verification.
A manufacturer and labeler index helps interpret public records from companies such as Teva, Aurobindo, Lupin and Ascend without declaring that any pharmacy stocks a given package.
An online catalogue may retain the original brand photograph or name long after marketing changed. That is a reason to verify the actual physical product from a legitimate pharmacy, including the applicant or labeler and the supplied NDC. The same caution applies if a seller represents itself as the sole source of the “real Keflex.”
A clinician or patient may still use Keflex as shorthand for cephalexin, particularly when referencing past treatment. The active ingredient and directions on the valid prescription, however, control what the dispensing pharmacy must interpret.
If a prescription specifies the old brand or has unclear product instructions, ask the prescriber and pharmacist to resolve it. A consumer should not personally replace a brand-only entry with an arbitrary capsule count or liquid strength.
A website that advertises original Keflex for immediate shipment should be examined with particular care. The historic name can attract outdated product pages or questionable sellers who do not require valid prescriptions.
A licensed U.S. pharmacy should verify the actual item, the lawful dispensing pathway and pharmacist access. See online pharmacy verification rather than treating brand-name search rankings as evidence of legitimacy.
Published historic Keflex prices are not useful evergreen benchmarks for today’s generic cephalexin claims. Cost depends on the actual dispensed form, strength, quantity and insurance or cash payment method.
For a fair comparison, request current quotes for the authorized generic product. Use the pricing hub and do not assume a branded prescription carries a fixed premium.
Price comparisons that mix an old Keflex brand name and a current generic package can create a fictitious brand premium. For the patient, the useful economic information is the final pharmacy charge for a legally dispensable generic on the written prescription. Neither a brand name nor a past list price settles that transaction.
Choosing an antibiotic for a skin infection, UTI or another condition is a medical decision. Brand nostalgia should not supersede organism susceptibility, allergy, kidney function or the clinical presentation.
A clinician should also distinguish possible MRSA or abscesses from routine nonpurulent skin infections, where antimicrobial strategy may differ. The skin infection overview provides that separate indication context.
Treat Keflex as the historical brand identity of cephalexin. Confirm the current generic ingredient, prescribed strength, dosage form, directions and manufacturer identification, then use a licensed pharmacy with a valid prescription.
FDA discontinued-brand records should never be used to claim current brand availability or to discourage lawful generic dispensing. Partner disclosure: commercial referrals, if present elsewhere on the site, do not establish the availability of Keflex-branded stock.
Keflex is a former U.S. brand name for the cephalosporin antibiotic cephalexin.
FDA Orange Book records place the original Keflex capsule products in the discontinued list. A current pharmacy should verify available generic cephalexin rather than promise branded stock.
Yes, approved generic cephalexin contains cephalexin, but product form, strength and approved equivalence must be checked for the prescription.
They are part of historical branded product records. Their appearance does not confirm current retail availability.
Substitution depends on prescription instructions, applicable law, FDA equivalence and pharmacist judgment. Discuss any unclear order with the pharmacy.
Cephalexin requires a valid U.S. prescription, regardless of whether a seller uses the historical brand or generic name.
No. Antibiotics with different active ingredients require individualized clinical decisions, even when they may be used for similar infections.
No. Verify the actual product, regulatory status, licensing and stock directly with a legitimate dispensing pharmacy.