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Primidone is an anticonvulsant drug used to treat seizures and essential tremor. It works by stabilizing electrical activity in the brain, which helps prevent the occurrence of seizures. Primidone is often used in combination with other antiepileptic drugs and is particularly effective in treating generalized tonic-clonic seizures and focal seizures.
Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Primidone and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Primidone impurities, metabolites, nitrosamine derivatives (N-NO compounds), and stable isotope-labeled products. These reference standards play a critical role in pharmaceutical R&D, supporting activities such as product formulation, ANDA and DMF submissions, quality assurance, analytical method development, and stability assessments.
All Primidone-related substances undergo comprehensive characterization and are delivered with complete Certificates of Analysis and supporting analytical documentation to ensure regulatory adherence. Upon request, we can offer EP/USP traceable standards. Our products are routinely re-evaluated to maintain consistent quality and performance.

Primidone
CAT No: CL-PRME-01 CAS No: 125-33-7 Mol Wt: 218.3 Mol F: C12H14N2O2 Inv Status: Custom Synthesis
Chemical Name: 5-Ethyl-5-phenyldihydropyrimidine-4,6(1H,5H)-dione
Primidone EP Impurity A
CAT No: CL-PRME-02 CAS No: 7206-76-0 Mol Wt: 206.2 Mol F: C11H14N2O2 Inv Status: Custom Synthesis
Chemical Name: 2-Ethyl-2-phenylpropanediamide
Primidone EP Impurity B
CAT No: CL-PRME-03 CAS No: 50-06-6 Mol Wt: 232.2 Mol F: C12H12N2O3 Inv Status: Custom Synthesis
Chemical Name: 5-Ethyl-5-phenylpyrimidine-2,4,6(1H,3H,5H)-trione
Primidone EP Impurity C
CAT No: CL-PRME-04 CAS No: 90-26-6 Mol Wt: 163.2 Mol F: C10H13NO Inv Status: Custom Synthesis
Chemical Name: (2RS)-2-phenylbutanamide
Primidone EP Impurity D
CAT No: CL-PRME-05 CAS No: 80544-75-8 Mol Wt: 188.2 Mol F: C11H12N2O Inv Status: Custom Synthesis
Chemical Name: (2RS)-2-cyano-2-phenylbutanamide
Primidone EP Impurity E
CAT No: CL-PRME-06 CAS No: 90-27-7 Mol Wt: 164.2 Mol F: C10H12O2 Inv Status: Custom Synthesis
Chemical Name: (2RS)-2-phenylbutanoic acid
Primidone EP Impurity F
CAT No: CL-PRME-07 CAS No: 1189504-46-8 Mol Wt: 336.4 Mol F: C21H24N2O2 Inv Status: Custom Synthesis
Chemical Name: 5-Ethyl-5-phenyl-2-[(1RS)-1-phenylpropyl]dihydropyrimidine-4,6(1H,5H)-dione
Primidone D5
CAT No: CL-PRME-08 CAS No: 73738-06-4 Mol Wt: 223.3 Mol F: C12H9D5N2O2 Inv Status: Custom Synthesis
Chemical Name: 5-(Ethyl-d5)-5-phenyldihydropyrimidine-4,6(1H,5H)-dione
Primidone Impurity 1
CAT No: CL-PRME-09 CAS No: NA Mol Wt: 222.3 Mol F: C11H14N2OS Inv Status: Custom Synthesis
Chemical Name: N-Carbamothioyl-2-Phenylbutanamide
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