as
- Asacol
- Asaphen
- Asbron
- Asceniv
- ascorbic acid (INN)
- Ascorbicap
- Ascriptin
- Asellacrin 10
- aselizumab (INN)
- asenapine (INN)
- Asendin
- aseripide (INN)
- Aservo Equihaler
- asfotase alfa (INN)
- asimadoline (INN)
- Asmalix, also known as theophylline.
- asobamast (INN)
- asocainol (INN)
- asoprisnil (USAN)
- asparaginase (INN)
- aspartame (INN)
- aspartic acid (INN)
- aspartocin (INN)
- Aspercin
- Aspergum
- aspirin
- aspoxicillin (INN)
- Astelin
- astemizole (INN)
- Astramorph PF
- astromicin (INN)
- astuprotimut-R (USAN)
- asunaprevir (USAN, INN)
at
ata-atn
- Atabrine (Abbott)
- Atacand
- atacicept (USAN, INN)
- ataciguat (INN)
- atagabalin (USAN, INN)
- ataluren (USAN, INN)
- atamestane (INN)
- ataprost (INN)
- Atapryl
- Atarax
- Atasol
- atazanavir (USAN)
- atecegatran fexenetil (INN)
- atecegatran (INN)
- Atehexal
- atenolol (INN)
- atevirdine (INN)
- atexakin alfa (INN)
- ATG
- Atgam
- Athrombin-K
- Athrombin
- atibeprone (INN)
- atidarsagene autotemcel (USAN, INN)
- atiglifozin (INN)
- atilmotin (USAN)
- atinumab (INN)
- atinvicitinib (INN)
- atiratecan (INN)
- atipamezole (INN)
- atiprimod (INN)
- atiprosin (INN)
- Ativan
- atizoram (INN)
- atliprofen (INN)
- Atnaa
ato-atz
- atolide (INN)
- Atolone Oral
- atomoxetine (USAN)
- atopaxar (USAN, INN)
- atorolimumab (INN)
- Atorvaliq
- atorvastatin (INN)
- atosiban (INN)
- atovaquone (INN)
- Atozine Oral
- atracurium besilate (INN)
- atrasentan (INN)
- atreleuton (INN)
- atriciguat (INN)
- Atridox
- atrimustine (INN)
- atrinositol (INN)
- Atrohist Plus
- atromepine (INN)
- Atromid-S
- Atropen
- atropine
- atropine methonitrate (INN)
- atropine oxide (INN)
- Atrosept
- Atrovent
- Attenuvax
- Attrogy
- Attruby
- Atzumi
au
- Aucatzyl
- Augmentin
- Augtyro
- Auralgan
- auranofin (INN)
- Aureomycin
- Aurexis
- Aurodex
- Aurolate
- aurothioglycanide (INN)
- Auroto
- Aususvar
- Autoplex T
av
- avagacestat (USAN, INN)
- Avagard
- Avage
- Avalide
- Avance
- Avmapki
- Avmapki Fakzynja
- avanafil (USAN)
- Avandamet
- Avandia
- Avapro
- AVAR
- avasimibe (INN)
- Avastin
- Avaxim
- AVC
- Aveeno Cleansing Bar
- Avelox
- Aventyl
- Avgemsi
- Aviane
- avibactam (INN)
- avicatonin (INN)
- avilamycin (INN)
- Avinza
- aviptadil (INN)
- aviscumine (INN)
- Avita
- Avitene
- avitriptan (INN)
- avizafone (INN)
- Avlayah
- Avlosulfon
- avobenzone (INN)
- Avodart
- Avonex
- avoparcin (INN)
- avorelin (INN)
- avosentan (INN)
- avotermin (INN)
- avridine (INN)
- Avtozma
- Avzivi
aw-ay
- Awiqli
- Awiqli FlexTouch
- axamozide (INN)
- axatilimab (INN)
- Axberi
- Axberi HP
- Axert
- axicabtagene ciloleucel (USAN, INN)
- Axid
- axitinib (USAN)
- Axocet
- axomadol (USAN)
- Axotal
- Aybintio
- Aygestin
- Ayradia
az
aza
azab-azaq
- azabon (INN)
- azabuperone (INN)
- azacitidine (INN)
- azaclorzine (INN)
- azaconazole (INN)
- azacosterol (INN)
- Azactam
- azacyclonol (INN)
- azaftozine (INN)
- Azahexal (Hexal Australia) [Au], also known as azathioprine.
- azalanstat (INN)
- azalomycin (INN)
- azaloxan (INN)
- azamethonium bromide (INN)
- azamulin (INN)
- azanator (INN)
- azanidazole (INN)
- azaperone (INN)
- azaprocin (INN)
- azapropazone (INN)
- azaquinzole (INN)
azar-azat
- azaribine (INN)
- Azasan
- azaserine (INN)
- azasetron (INN)
- azaspirium chloride (INN)
- azastene (INN)
- azatadine (INN)
- azatepa (INN)
- azathioprine (INN)
azd-azm
- Azdone
- azelaic acid (INN)
- azelastine (INN)
- Azelex
- azelnidipine (INN)
- azepexole (INN)
- azepindole (INN)
- azetirelin (INN)
- azficel-T (USAN)
- azidamfenicol (INN)
- azidocillin (INN)
- azilsartan (INN)
- azilsartan kamedoxomil (USAN)
- azilsartan medoxomil (USAN)
- azimexon (INN)
- azimilide (INN)
- azintamide (INN)
- azipramine (INN)
- azithromycin (INN)
- Azlin
- azlocillin (INN)
- Azmacort
azo-azu
- Azo Gantanol
- Azo Gantrisin
- Azolid
- azolimine (INN)
- Azopt
- azosemide (INN)
- azotomycin (INN)
- azoximer bromide (INN)
- aztreonam (INN)
- Azulfidine
- azumolene (INN)