- Aatrombopag
- Abacavir
- Abemaciclib
- Abietic Acid
- Abiraterone
- Abiraterone Acetate
- Abrocitinib
- Abscisic Acid
- Acalabrutinib
- Acamprosate
- Acarbose
- Acebutalol
- Acebutolol
- Aceclofenac
- Acemetacin
- Aceprozine
- Acesulfame Potassium
- Acetaminophen
- Acetonitrile
- Acetophenone
- Acetovanillone
- Acetylcysteine
- Acetylsalicylic Acid
- Aciclovir
- Acitretin
- Acotiamide
- Acridine
- Acrivastine
- Acyclovir
- Adamantane
- Adapalene
- Adefovir
- Adenine
- Adenosine
- Adrenaline
- Adrenalone
- Aeruginascine
- Afatinib
- Aflatoxin
- Agomelatine
- Albendazole
- Albuterol
- Alcaftadine
- Alclometasone
- Aldose Reductase-
- Aldox
- Alectinib
- Alendronate
- Alendronic Acid
- Alfacalcidol
- Alfentanil
- Alfuzosin
- Algestone
- Alimemazine
- Alizapride
- Allopurinol
- Allyl Amine
- Allylestrenol
- Almotriptan
- Alogliptin
- Alosetron
- Alprostadil
- Altizide
- Alverine
- Alvimopan
- Amantadine
- Ambrisentan
- Ambroxol
- Ametryn
- Amfenac
- Amifostine
- Amikacin
- Amiloride
- Aminocaproic Acid
- Aminolevulinic Acid
- Amiodarone
- Amisulpride
- Amitraz
- Amitriptyline
- Amlodipine
- Ammonium Glycyrrhiza...
- Amodiaquine
- Amorolfine
- Amoxapine
- Amoxicillin
- Amoxicillin Trihydra...
- Amoxycillin
- Amphetamine
- Amphotericin
- Amphotericin B
- Ampicillin
- Amylmetacresol
- Anabasine
- Anagrelide
- Anamorelin
- Anastrozole
- Anatabine
- Andarine
- Androstane
- Androstene
- Androstenediol
- Androstenedione
- Angolensin
- Anidulafungin
- Aniline
- Anthracene
- Anthraquinone
- Apalutamide
- Apigenin
- Apilacetin
- Apixaban
- Apomorphine
- Apremilast
- Aprepitant
- Arbidol
- Arformoterol
- Argatroban
- Arginine
- Arimistane
- Aripiprazole
- Artemesinin
- Artemether
- Artemisinin
- Arterolane
- Artesunate
- Articaine
- Ascomycin
- Ascorbic Acid
- Asenapine
- Aspartame
- Aspirin
- Atazanavir
- Atenolol
- Atipamezole
- Atogepant
- Atomoxetine
- Atorvastatin
- Atorvastatin Acid
- Atovaquone
- Atovaquone`
- Atovastatin
- Atracurium
- Atrazine
- Atropine
- Avacopan
- Avanafil
- Avatrombopag
- Avenanthramide A
- Avermectin
- Avibactam
- Avibactam Sodium
- Axitinib
- Azacitidine
- Azacyclonol
- Azathioprine
- Azelaic Acid
- Azelastine
- Azelnidipine
- Azilsartan
- Azirine
- Azithromycin
- Aztreonam