- A. Menarini
- A. Natterman & Cie
- AAA Pharma
- Abbott
- Abbott Products [CO]
- Abbvie
- ABC Farmaceutici
- Abela Pharm
- ABGPH Corp
- Accord Healthcare
- ACME
- ACS Dobfar
- AD-Drugstel
- ADP Pharma
- Aesculapius Farmaceutici
- Aesica Queenborough
- Again Life Italia
- AGB Pharma
- Agio
- AGlobal Care
- Ahlcon Parenterals
- Aim High
- Aisec Farma
- Ajanta Pharma
- Ajanta Pharma Phil
- Ajinomoto
- Aju Pharm
- Akums Drug
- Alcon
- Aldo-Union
- ALFASIGMA
- Alkem Lab
- All Medica
- Allianz Biosciences
- Altratec
- Alvita Pharma
- Amanta Healthcare
- AMB
- Ambica
- Ambicare
- American Taiwan Biopharma
- Am-Europharma
- Amgen
- Amherst Lab
- AMN Life Science
- Amtol Pharma
- Anfarm Hellas
- AOP Orphan
- Apipharma
- Apotex
- Applied Pharma
- Ashford Pharma
- Asian Antibiotics
- Asoj
- Aspen
- Aspen Pharma
- Aspiro Pharma
- Astellas
- AstraZeneca
- AstraZeneca - CV/Resp/CNS/GI
- AstraZeneca AB
- Athena
- Atlanta Biological
- Atlantic Lab
- Atlantic Pharma
- Atnahs Pharma
- Atoz Pharmaceuticals
- Aurochem Lab
- Avara Liscate
- Ayamed Drug Distributor
- A-Z Med Inc