- 2,3,7,8-Tetrachlorodibenzo-p-dioxin
- 2,4,5-T
- 2,4,5-T (trichloro-phenoxyacetic acid)
- 2,4,5-Trichlorophen-oxyacetic acid
- ABOB
- Abrine
- Abrus (seed)
- Absinthe
- Acaricide
- Acebutolol
- Acecarbromal
- Aceclidine
- Acedapsone
- Acefylline piperazine
- Acemorphan
- Acenocoumarin
- Acenocoumarol
- Acepifylline
- Acepromazine
- Acesulfamethoxypyridazine
- Acetal
- Acetaldehyde (vapor)
- Acetaminophen
- Acetaminosalol
- Acetanilide
- Acetarsol
- Acetazolamide
- Acetiamine
- Acetic
- Acetohexamide
- Acetohydroxamic acid
- Acetomenaphthone
- Acetomorphine
- Acetone (oils)
- Acetonitrile
- Acetophenazine
- Acetophenetedin
- Acetophenone
- Acetorphine
- Acetosulfone (sodium)
- Acetrizoate (sodium)
- Acetrizoic acid
- Acetyl
- Acetylcarbromal
- Acetylcholine
- Acetylcysteine
- Acetyldigitoxin
- Acetyldigoxin
- Acetyldihydrocodeine
- Acetyldihydrocodeinone
- Acetylene (gas)
- Acetylpheneturide
- Acetylphenylhydrazine
- Acetylsalicylic acid (salts)
- Acetylsulfamethoxypyridazine
- Achromycin
- Aciclovir
- Acid (corrosive) NEC
- Acidifying agent NEC
- Acipimox
- Acitretin
- Aclarubicin
- Aclatonium napadisilate
- Aconite (wild)
- Aconitine
- Aconitum ferox
- Acridine
- Acriflavine
- Acriflavinium chloride
- Acrinol
- Acrisorcin
- Acrivastine
- Acrolein (gas)
- Acrylamide
- Acrylic resin
- Acrylonitrile
- Actaea spicata
- Acterol
- ACTH
- Actinomycin C
- Actinomycin D
- Activated charcoal
- Acyclovir
- Adenine
- Adenosine (phosphate)
- ADH
- Adhesive NEC
- Adicillin
- Adiphenine
- Adipiodone
- Adjunct, pharmaceutical
- Adrenal (extract, cortex or medulla)(glucocorticoids)(hormones)(mineralocorticoids)
- Adrenalin
- Adrenaline
- Adrenergic NEC
- Adrenochrome
- Adrenocorticotrophic hormone
- Adrenocorticotrophin
- Adriamycin
- Aerosol spray NEC
- Aerosporin
- Aethusa cynapium
- Afghanistan black
- Aflatoxin
- Afloqualone
- African boxwood
- Agar
- Agonist
- Agricultural agent NEC
- Agrypnal
- AHLG
- Air contaminant (s), source/type NOS
- Ajmaline
- Akee
- Akrinol
- Akritoin
- Alacepril
- Alantolactone
- Albamycin
- Albendazole
- Albumin
- Albuterol
- Albutoin
- Alclometasone
- Alcohol
- Alcuronium (chloride)
- Aldactone
- Aldesulfone sodium
- Aldicarb
- Aldomet
- Aldosterone
- Aldrin (dust)
- Aleve
- Alexitol sodium
- Alfacalcidol
- Alfadolone
- Alfaxalone
- Alfentanil
- Alfuzosin (hydrochloride)
- Algae (harmful) (toxin)
- Algeldrate
- Algin
- Alglucerase
- Alidase
- Alimemazine
- Aliphatic thiocyanates
- Alizapride
- Alkali (caustic)
- Alkaline antiseptic solution (aromatic)
- Alkalinizing agents (medicinal)
- Alkalizing agent NEC
- Alka-seltzer
- Alkavervir
- Alkonium (bromide)
- Alkylating drug NEC
- Alkylisocyanate
- Allantoin
- Allegron
- Allethrin
- Allobarbital
- Allopurinol
- Allyl
- Allylestrenol
- Allylisopropylacetylurea
- Allylisopropylmalonylurea
- Allylthiourea
- Allyltribromide
- Allypropymal
- Almagate
- Almasilate
- Almitrine
- Aloes
- Aloglutamol
- Aloin
- Aloxidone
- Alpha
- Alphadolone
- Alphaprodine
- Alphaxalone
- Alprazolam
- Alprenolol
- Alprostadil
- Alsactide
- Alseroxylon
- Alteplase
- Altizide
- Altretamine
- Alum (medicinal)
- Aluminium, aluminum
- Alurate
- Alverine
- Alvodine
- Amanita phalloides
- Amanitine
- Amantadine
- Ambazone
- Ambenonium (chloride)
- Ambroxol
- Ambuphylline
- Ambutonium bromide
- Amcinonide
- Amdinocilline
- Ametazole
- Amethocaine
- Amethopterin
- Amezinium metilsulfate
- Amfebutamone
- Amfepramone
- Amfetamine
- Amfetaminil
- Amfomycin
- Amidefrine mesilate
- Amidone
- Amidopyrine
- Amidotrizoate
- Amiflamine
- Amikacin
- Amikhelline
- Amiloride
- Aminacrine
- Amineptine
- Aminitrozole
- Aminoacetic acid (derivatives)
- Amino acids
- Aminoacridine
- Aminobenzoic acid (-p)
- 4-Aminobutyric acid
- Aminocaproic acid
- Aminoethylisothiourium
- Aminofenazone
- Aminoglutethimide
- Aminohippuric acid
- Aminomethylbenzoic acid
- Aminometradine
- Aminopentamide
- Aminophenazone
- Aminophenol
- 4-Aminophenol derivatives
- Aminophenylpyridone
- Aminophylline
- Aminopterin sodium
- Aminopyrine
- 8-Aminoquinoline drugs
- Aminorex
- Aminosalicylic acid
- Aminosalylum
- Amiodarone
- Amiphenazole
- Amiquinsin
- Amisometradine
- Amisulpride
- Amitriptyline
- Amitriptylinoxide
- Amlexanox
- Ammonia (fumes) (gas) (vapor)
- Ammoniated mercury
- Ammonium
- Amobarbital (sodium)
- Amodiaquine
- Amopyroquin (e)
- Amoxapine
- Amoxicillin
- Amperozide
- Amphenidone
- Amphetamine NEC
- Amphomycin
- Amphotalide
- Amphotericin B
- Ampicillin
- Amprotropine
- Amsacrine
- Amygdaline
- Amyl
- Amylase
- Amyleine, regional
- Amylene
- Amylmetacresol
- Amylobarbitone
- Amylocaine, regional
- Amylopectin
- Amytal (sodium)
- Anabolic steroid
- Analeptic NEC
- Analgesic
- Analgin
- Anamirta cocculus
- Ancillin
- Ancrod
- Androgen
- Androgen-estrogen mixture
- Androstalone
- Androstanolone
- Androsterone
- Anemone pulsatilla
- Anesthesia
- Anesthetic NEC
- Aneurine
- Angio-Conray
- Angiotensin
- Angiotensinamide
- Anhydrohydroxy-progesterone
- Anhydron
- Anileridine
- Aniline (dye) (liquid)
- Aniscoropine
- Anise oil
- Anisidine
- Anisindione
- Anisotropine methyl-bromide
- Anistreplase
- Anorexiant (central)
- Anorexic agents
- Ansamycin
- Ant (bite) (sting)
- Antabuse
- Antacid NEC
- Antagonist
- Antazolin (e)
- Anterior pituitary hormone NEC
- Anthelmintic NEC
- Anthiolimine
- Anthralin
- Anthramycin
- Antiadrenergic NEC
- Antiallergic NEC
- Antiandrogen NEC
- Anti-anemic (drug) (preparation)
- Antianxiety drug NEC
- Antiaris toxicaria
- Antiarteriosclerotic drug
- Antiasthmatic drug NEC
- Antibiotic NEC
- Anticancer agents NEC
- Anticholesterolemic drug NEC
- Anticholinergic NEC
- Anticholinesterase
- Anticoagulant NEC
- Anti-common-cold drug NEC
- Anticonvulsant
- Antidepressant
- Antidiabetic NEC
- Antidiarrheal drug NEC
- Anti-D immunoglobulin (human)
- Antidiphtheria serum
- Antidiuretic hormone
- Antidote NEC
- Antidysrhythmic NEC
- Antiemetic drug
- Antiepilepsy agent
- Antiestrogen NEC
- Antifertility pill
- Antifibrinolytic drug
- Antifilarial drug
- Antiflatulent
- Antifreeze
- Antifungal
- Anti-gastric-secretion drug NEC
- Antigonadotrophin NEC
- Antihallucinogen
- Antihelmintics
- Antihemophilic
- Antihemorrhoidal preparation
- Antiheparin drug
- Antihistamine
- Antihookworm drug
- Anti-human lymphocytic globulin
- Antihyperlipidemic drug
- Antihypertensive drug NEC
- Anti-infective NEC
- Anti-inflammatory drug NEC
- Antikaluretic
- Antiknock (tetraethyl lead)
- Antilipemic drug NEC
- Antimalarial
- Antimetabolite
- Antimitotic agent
- Antimony (compounds) (vapor) NEC
- Antimuscarinic NEC
- Antimycobacterial drug NEC
- Antinausea drug
- Antinematode drug
- Antineoplastic NEC
- Antiparasitic drug (systemic)
- Antiparkinsonism drug NEC
- Antiperspirant NEC
- Antiphlogistic NEC
- Antiplatyhelmintic drug
- Antiprotozoal drug NEC
- Antipruritic drug NEC
- Antipsychotic drug
- Antipyretic
- Antipyrine
- Antirabies hyperimmune serum
- Antirheumatic NEC
- Antirigidity drug NEC
- Antischistosomal drug
- Antiscorpion sera
- Antiseborrheics
- Antiseptics (external) (medicinal)
- Antistine
- Antitapeworm drug
- Antitetanus immunoglobulin
- Antithrombotic
- Antithyroid drug NEC
- Antitoxin
- Antitrichomonal drug
- Antituberculars
- Antitussive NEC
- Antivaricose drug
- Antivenin, antivenom (sera)
- Antivertigo drug
- Antiviral drug NEC
- Antiwhipworm drug
- Ant poison
- Antrol
- ANTU (alpha naphthylthiourea)
- Apalcillin
- APC
- Aplonidine
- Apomorphine
- Appetite depressants, central
- Apraclonidine (hydrochloride)
- Apresoline
- Aprindine
- Aprobarbital
- Apronalide
- Aprotinin
- Aptocaine
- Aqua fortis
- Ara-A
- Ara-C
- Arachis oil
- Aralen
- Arecoline
- Arginine
- Argyrol
- Aristocort
- Aromatics, corrosive
- Arsenate of lead
- Arsenic, arsenicals (compounds) (dust) (vapor) NEC
- Arsine (gas)
- Arsphenamine (silver)
- Arsthinol
- Artane
- Arthropod (venomous) NEC
- Articaine
- Asbestos
- Ascaridole
- Ascorbic acid
- Asiaticoside
- Asparaginase
- Aspidium (oleoresin)
- Aspirin (aluminum) (soluble)
- Aspoxicillin
- Astemizole
- Astringent (local)
- Astromicin
- Ataractic drug NEC
- Atenolol
- Atonia drug, intestinal
- Atophan
- Atracurium besilate
- Atropine
- Attapulgite
- Auramine
- Auranofin
- Aurantiin
- Aureomycin
- Aurothioglucose
- Aurothioglycanide
- Aurothiomalate sodium
- Aurotioprol
- Automobile fuel
- Autonomic nervous system agent NEC
- Avlosulfon
- Avomine
- Axerophthol
- Azacitidine
- Azacyclonol
- Azadirachta
- Azanidazole
- Azapetine
- Azapropazone
- Azaribine
- Azaserine
- Azatadine
- Azatepa
- Azathioprine
- Azelaic acid
- Azelastine
- Azidocillin
- Azidothymidine
- Azinphos (ethyl) (methyl)
- Aziridine (chelating)
- Azithromycin
- Azlocillin
- Azobenzene smoke
- Azosulfamide
- AZT
- Aztreonam
- Azulfidine
- Azuresin
ICD-10-CM