Siegfried is a trusted partner for high-quality APIs supporting addiction treatment and abuse prevention. With world-scale manufacturing capabilities, an integrated supply chain, and extensive regulatory expertise, we ensure reliable supply to global markets. Our comprehensive portfolio includes Naloxone, Buprenorphine, Methadone, Naltrexone, and other highly regulated APIs, backed by decades of experience in complex pharmaceutical manufacturing.
9 API products
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Product nameand CAS number
Regulatory documentation
Therapeutic area
Formulation type
Product class
Buprenorphine Base
52485-79-7
CEP, JDMF, USDMF
Analgesic, Opioid addiction
Injectable, Transdermal
Addiction treatment & abuse prevention, Controlled substances, Pain management
Buprenorphine HCl
53152-21-9
CAN ASMF, CEP, USDMF
Analgesic, Opioid addiction
Injectable, Oral solid
Addiction treatment & abuse prevention, Controlled substances
Levomethadone HCl
125-58-6
CEP
Analgesic, Opioid addiction
Oral liquid, Oral solid
Addiction treatment & abuse prevention, Controlled substances
Methadone HCl
1095-90-5
CEP, USDMF
Analgesic, Opioid addiction
Injectable, Oral liquid, Oral solid
Addiction treatment & abuse prevention, Controlled substances
Methylnaltrexone Bromide
73232-52-7
USDMF
Opioid antagonist
Injectable, Oral solid
Addiction treatment & abuse prevention, Controlled substances
Nalmefene
55096-26-9
USDMF
Opioid antagonist
Oral solid
Addiction treatment & abuse prevention, Controlled substances
Naloxone HCl
357-08-4
CEP, USDMF
Opioid antagonist
Injectable, Nasal
Addiction treatment & abuse prevention, Controlled substances
Naltrexone Base
16590-41-3
USDMF
Opioid antagonist
Injectable
Addiction treatment & abuse prevention, Controlled substances
Naltrexone HCI
16676-29-2
BDMF, CDMF, CEP, KDMF, USDMF
Opioid antagonist
Oral solid
Addiction treatment & abuse prevention, Controlled substances