Ranked API manufacturers
Credentials confirmed against the regulator files on 25 July 2026
Holds 2 active US DMFs and one valid CEP for diphenhydramine, filing since 1980. Its 2022 FDA inspection closed as VAI, and its GMP is recognised in 15 markets.
Last FDA inspection
2022 · VAI
GMP recognised in
15 markets
Holds one active US DMF and one valid CEP for diphenhydramine, filing since 2008. Its 2024 FDA inspection closed as NAI.
Last FDA inspection
2024 · NAI
GMP recognised in
Not established
03 India
Makes the APIFinished dose
Credentials confirmed against the regulator files on 25 July 2026
Holds one active US DMF for diphenhydramine, filing since 2021. Its 2024 FDA inspection closed as VAI, and its GMP is recognised in 19 markets.
Last FDA inspection
2024 · VAI
GMP recognised in
19 markets
04 United States
Makes the API
Credentials confirmed against the regulator files on 25 July 2026
Holds one active US DMF for diphenhydramine, filing since 1994. Its 2026 FDA inspection closed as NAI, and its GMP is recognised in 2 markets.
Last FDA inspection
2026 · NAI
GMP recognised in
2 markets
Credentials confirmed against the regulator files on 25 July 2026
Holds 2 active US DMFs for diphenhydramine, filing since 2006. Its 2024 FDA inspection closed as NAI.
Last FDA inspection
2024 · NAI
GMP recognised in
Not established
Credentials confirmed against the regulator files on 25 July 2026
Holds one active US DMF for diphenhydramine, filing since 1980. Its 2023 FDA inspection closed as NAI.
Last FDA inspection
2023 · NAI
GMP recognised in
Not established
Credentials confirmed against the regulator files on 25 July 2026
Holds 2 active US DMFs for diphenhydramine, filing since 2020. Its 2026 FDA inspection closed as VAI, and its GMP is recognised in 1 market.
Last FDA inspection
2026 · VAI
GMP recognised in
1 markets
Credentials confirmed against the regulator files on 25 July 2026
Holds one active US DMF for diphenhydramine, filing since 2026. Its 2023 FDA inspection closed as NAI.
Last FDA inspection
2023 · NAI
GMP recognised in
Not established
Credentials confirmed against the regulator files on 25 July 2026
Holds one active US DMF for diphenhydramine, filing since 2006.
Last FDA inspection
Not established
GMP recognised in
Not established
Holds one active US DMF for diphenhydramine, filing since 2025.
Last FDA inspection
Not established
GMP recognised in
Not established
11 Vietnam
Makes the APIFinished dose
Registered with DAV (Vietnam) for diphenhydramine. Its GMP is recognised in 1 market.
Last FDA inspection
Not established
GMP recognised in
1 markets
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile 12 Vietnam
Makes the APIFinished dose
Registered with DAV (Vietnam) for diphenhydramine. Its GMP is recognised in 1 market.
Last FDA inspection
Not established
GMP recognised in
1 markets
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile 13 Vietnam
Makes the APIFinished dose
Registered with DAV (Vietnam) for diphenhydramine. Its GMP is recognised in 1 market.
Last FDA inspection
Not established
GMP recognised in
1 markets
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile 14 Vietnam
Makes the APIFinished dose
Registered with DAV (Vietnam) for diphenhydramine. Its GMP is recognised in 1 market.
Last FDA inspection
Not established
GMP recognised in
1 markets
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile 15 Vietnam
Makes the APIFinished dose
Registered with DAV (Vietnam) for diphenhydramine. Its GMP is recognised in 1 market.
Last FDA inspection
Not established
GMP recognised in
1 markets
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile Registered with DAV (Vietnam) for diphenhydramine.
Last FDA inspection
Not established
GMP recognised in
Not established
How this listing is sourced Regulator filings, warehouse snapshot 9 July 2026
View profile 13 more manufacturers hold filings for diphenhydramine
The names are listed below. The filings, inspection history and GMP certificates behind
each one are available with a free account.
Open the full list with a free account Contract manufacturers (3)
Contract manufacturers make to order rather than holding their own filing for this
molecule.
Finished-dose makers (93)
How this list is built
The order is set by active filings weighted by regulator, inspection outcomes and their
recency, breadth of GMP recognition, and evidence of real exports, less any open risk flags.
Every factor appears on the card it produced.
Read the full method.
- Active US DMFs
- FDA, List of Drug Master Files
- Valid CEPs
- EDQM certificate database
- Inspection outcomes
- FDA inspection classifications
- GMP certificates
- EudraGMDP and national regulators
- Price band
-
Customs export unit values for 2025. These are export values rather than
contract prices for regulated-market grade material, which are higher.