How Generic Drugs Get Approved (and Why That Lowers Prices)
By BetterBuyRx Editorial Team
Written for cost and savings education only — not medical advice, and not medically reviewed. Always confirm details with your doctor or pharmacist. See our methodology.
Last updated
Generic drugs are approved through the FDA's Abbreviated New Drug Application (ANDA) process, which requires manufacturers to prove bioequivalence to the original brand-name drug rather than repeating the brand's full clinical trials. Because generic makers can rely on the FDA's earlier finding that the brand drug is safe and effective, their development costs are far lower, which is a major reason generic prices tend to be significantly lower than brand-name prices once competition arrives.
Generic drugs are often assumed to be a lesser, cost-cutting version of a brand-name drug, but the actual FDA approval process explains why generics can be both rigorously vetted and meaningfully cheaper. Here's how it actually works.
The ANDA pathway, explained
Generic manufacturers seek approval through an Abbreviated New Drug Application, described in detail on the FDA's ANDA page. The application is "abbreviated" because it doesn't need to include the extensive preclinical and clinical trial data that the brand-name drug's manufacturer already submitted to prove safety and effectiveness. Instead, the generic manufacturer must show that its product is comparable to the already-approved reference drug in specific, well-defined ways.
Search your medication on BetterBuyRx to see whether generic versions are available for your prescription and how pricing compares to the brand-name option.
What bioequivalence actually means
Rather than repeating clinical trials, generic manufacturers must demonstrate bioequivalence, according to the FDA's overview of the generic approval process. This means showing that the generic version delivers the same amount of active ingredient into a person's bloodstream, at a similar rate, as the brand-name reference drug. The generic must also match the reference listed drug in active ingredient, strength, dosage form, and route of administration. This standard is designed to ensure the generic works the same way in the body, without requiring a duplicate, multi-year clinical trial program.
Why skipping full clinical trials makes generics cheaper
Clinical trials are one of the largest cost drivers in bringing a new drug to market, often taking years and substantial investment. Because generic manufacturers can rely on the FDA's prior determination that the reference drug is safe and effective, and only need to prove bioequivalence rather than repeat that full trial process, their development costs are dramatically lower. Those lower development costs are a major structural reason generics can be priced well below brand-name equivalents once they reach the market.
How much prices actually drop with generic competition
According to FDA's generic drug facts page, price reductions tend to grow as more generic manufacturers enter the market for a given drug: a single generic competitor produces a real but comparatively modest price drop, while markets with several competing generic manufacturers tend to see substantially larger price reductions. This is part of why the price of a newly generic drug can continue falling for a period after the very first generic version launches, as additional manufacturers enter and compete on price.
What the Orange Book confirms
The FDA maintains a public reference called the Orange Book, listing approved drug products along with therapeutic equivalence evaluations. Pharmacists use this resource to confirm that a specific generic product is considered therapeutically equivalent to a specific brand-name reference drug, which is part of the regulatory infrastructure that allows pharmacies to substitute an approved generic for a prescribed brand-name drug in most states.
Generic approval at a glance
| Step | What it involves |
|---|---|
| Application type | Abbreviated New Drug Application (ANDA) |
| Core requirement | Demonstrate bioequivalence to the reference brand drug |
| Clinical trials required | Not a full repeat; relies on FDA's prior safety/efficacy finding for the brand drug |
| Match requirements | Same active ingredient, strength, dosage form, and route of administration |
| Public confirmation | Listed in the FDA's Orange Book with a therapeutic equivalence rating |
Why generics can still take years to arrive
Even after a generic manufacturer completes the ANDA process, patents and regulatory exclusivity periods on the original brand-name drug can delay when a generic is legally allowed to enter the market. This is a separate legal and regulatory timeline from the scientific approval process itself, so a generic being "approved" doesn't always mean it can be sold immediately. Compare prescription prices on BetterBuyRx to check current availability and pricing for your specific medication, since this varies by drug.
Ask your pharmacist about generic options
If you're prescribed a brand-name drug, ask your pharmacist or doctor whether an FDA-approved generic version is available, and whether switching is appropriate for your specific health situation. Only your prescriber can make that medical determination, but pharmacists can tell you about pricing differences and availability.
The bottom line on generic drug approval
The ANDA bioequivalence standard is what allows generic drugs to be both rigorously reviewed and meaningfully less expensive than brand-name originals. Check prices near you on BetterBuyRx to see how much a generic version of your medication might save you. Prices vary by pharmacy, location, quantity, and eligibility.
Frequently asked questions
Do generic drugs have to go through the same clinical trials as brand-name drugs?
No. Generic drug manufacturers don't need to repeat the large-scale clinical trials for safety and effectiveness that the original brand-name drug already completed. Instead, they must demonstrate bioequivalence, showing the generic delivers the same amount of active ingredient into the bloodstream at a similar rate as the brand-name version.
What is an ANDA?
ANDA stands for Abbreviated New Drug Application, the FDA application pathway generic manufacturers use to seek approval. It's called 'abbreviated' because it relies on the FDA's prior finding that the reference brand-name drug is safe and effective, rather than requiring the generic maker to prove that from scratch.
How much do prices typically drop once generics become available?
According to FDA data, prices tend to drop meaningfully as more generic manufacturers enter the market, with the largest price reductions occurring once several competitors are selling the same generic, since a single generic entrant produces a smaller price drop than robust multi-manufacturer competition.
What is the Orange Book?
The Orange Book is the FDA's public listing of approved drug products along with therapeutic equivalence evaluations, which pharmacists and others use to confirm whether a specific generic is considered equivalent to a specific brand-name drug.
Why do some brand-name drugs delay generic competition for years?
Patents and regulatory exclusivity periods on the original brand-name drug can delay when generic manufacturers are legally allowed to market a competing version, even if they've already completed the approval process. This is a separate legal question from the FDA approval process itself.
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Compare prices & find savings
This guide is for cost and savings education only. It is not medical advice. Talk to your doctor or pharmacist before making any changes to your medications. Prices vary by pharmacy, location, quantity, and eligibility, and they change over time.
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