Active Pharmaceutical Ingredient Directory
2,594+ active pharmaceutical ingredients with verified FDA Drug Master File suppliers, CAS numbers, chemical identity and US patent-expiry dates — screened against live FDA enforcement data.
API patent cliff — upcoming US expiries
APIs whose latest listed US patent or exclusivity (FDA Orange Book) expires soonest — the moment generic sourcing opens up. Plan your sourcing pipeline ahead of the cliff.
Get the API patent-cliff watchlist
Monthly digest of APIs coming off US patent/exclusivity — so you can line up qualified suppliers before generics open up. No spam; unsubscribe anytime.
Most-supplied APIs
Rivaroxaban
CAS 366789-02-8 · 57 suppliers
Pantoprazole
CAS 102625-70-7 · 53 suppliers
Apixaban
CAS 503612-47-3 · 51 suppliers
Sitagliptin
CAS 486460-32-6 · 50 suppliers
Semaglutide
CAS 910463-68-2 · 48 suppliers
Aripiprazole
CAS 129722-12-9 · 45 suppliers
Atorvastatin
CAS 134523-00-5 · 44 suppliers
Telmisartan
CAS 144701-48-4 · 43 suppliers
Empagliflozin
CAS 864070-44-0 · 42 suppliers
Amoxicillin
CAS 26787-78-0 · 41 suppliers
Pregabalin
CAS 148553-50-8 · 40 suppliers
Clopidogrel
CAS 113665-84-2 · 40 suppliers
Bosentan
CAS 147536-97-8 · 40 suppliers
Ampicillin
CAS 69-53-4 · 40 suppliers
Esomeprazole
CAS 119141-88-7 · 39 suppliers
Olmesartan Medoxomil
CAS 144689-63-4 · 38 suppliers
Valsartan
CAS 137862-53-4 · 37 suppliers
Levetiracetam
CAS 102767-28-2 · 37 suppliers
Losartan
CAS 114798-26-4 · 36 suppliers
Lurasidone Hydrochloride
CAS 367514-88-3 · 35 suppliers
Ticagrelor
CAS 274693-27-5 · 35 suppliers
Lansoprazole
CAS 103577-45-3 · 35 suppliers
Amlodipine
CAS 88150-42-9 · 34 suppliers
Rosuvastatin
CAS 147098-20-2 · 34 suppliers
Lamotrigine
CAS 84057-84-1 · 33 suppliers
Paclitaxel
CAS 33069-62-4 · 33 suppliers
Atenolol
CAS 29122-68-7 · 33 suppliers
Omeprazole
CAS 73590-58-6 · 33 suppliers
Lacosamide
CAS 175481-36-4 · 33 suppliers
Mirabegron
CAS 223673-61-8 · 33 suppliers
Enzalutamide
CAS 915087-33-1 · 32 suppliers
Ibuprofen
CAS 15687-27-1 · 32 suppliers
Dabigatran Etexilate Mesylate
31 suppliers
Nifedipine
CAS 21829-25-4 · 30 suppliers
Celecoxib
CAS 169590-42-5 · 30 suppliers
Mesalamine
CAS 89-57-6 · 30 suppliers
Pirfenidone
CAS 53179-13-8 · 29 suppliers
Solifenacin Succinate
CAS 242478-38-2 · 29 suppliers
Metoprolol
CAS 37350-58-6 · 29 suppliers
Quetiapine Fumarate
CAS 111974-72-2 · 29 suppliers
Linagliptin
CAS 668270-12-0 · 29 suppliers
Topiramate
CAS 97240-79-4 · 29 suppliers
Tofacitinib
CAS 477600-75-2 · 29 suppliers
Anastrozole
CAS 120511-73-1 · 28 suppliers
Potassium
CAS 7440-09-7 · 28 suppliers
Acyclovir
28 suppliers
Metformin
CAS 657-24-9 · 28 suppliers
Allopurinol
CAS 315-30-0 · 28 suppliers
Docetaxel
CAS 114977-28-5 · 28 suppliers
Risperidone
CAS 106266-06-2 · 27 suppliers
Levofloxacin
CAS 100986-85-4 · 27 suppliers
Methocarbamol
CAS 532-03-6 · 27 suppliers
Escitalopram Oxalate
CAS 219861-08-2 · 27 suppliers
Irbesartan
CAS 138402-11-6 · 27 suppliers
Chlorthalidone
CAS 77-36-1 · 27 suppliers
Ranolazine
CAS 95635-55-5 · 27 suppliers
Capecitabine
CAS 154361-50-9 · 27 suppliers
Olanzapine
CAS 132539-06-1 · 27 suppliers
Chlorhexidine
27 suppliers
Duloxetine
CAS 116539-59-4 · 27 suppliers
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