CADUET® (amlodipine besylate and atorvastatin calcium)
tablets combine the long-acting calcium channel blocker amlodipine besylate with
the synthetic lipid-lowering agent atorvastatin calcium.
The amlodipine besylate component of CADUET is chemically described as 3-Ethyl-5-methyl
(±)-2-[(2-aminoethoxy)methyl]-4-(o-chlorophenyl)-1,4-dihydro-6-methyl-3,5 pyridinedicarboxylate,
monobenzenesulphonate. Its empirical formula is C20H25ClN2O5•C6H
6O3S.
The atorvastatin calcium component of CADUET is chemically described as [R-(R*,
R*)]-2-(4-fluorophenyl)-β, δ-dihydroxy-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrole-1-heptanoic
acid, calcium salt (2:1) trihydrate. Its empirical formula is (C33H34FN2O5)2Ca
•3H2O.
The structural formulae for amlodipine besylate and atorvastatin calcium are shown
below.
CADUET contains amlodipine besylate, a white to off-white crystalline powder, and
atorvastatin calcium, also a white to off-white crystalline powder. Amlodipine besylate
has a molecular weight of 567.1 and atorvastatin calcium has a molecular weight
of 1209.42. Amlodipine besylate is slightly soluble in water and sparingly
soluble in ethanol. Atorvastatin calcium is insoluble in aqueous solutions
of pH 4 and below. Atorvastatin calcium is very slightly soluble in distilled water,
pH 7.4 phosphate buffer, and acetonitrile; slightly soluble in ethanol, and freely
soluble in methanol.
CADUET tablets are formulated for oral administration in the following strength
combinations:
Table 1. Caduet Tablet Strengths
Each tablet also contains calcium carbonate, croscarmellose sodium, microcrystalline
cellulose, pregelatinized starch, polysorbate 80, hydroxypropyl cellulose, purified
water, colloidal silicon dioxide (anhydrous), magnesium stearate, Opadry®
II White 85F28751 (polyvinyl alcohol, titanium dioxide, PEG 3000 and talc) or Opadry®
II Blue 85F10919 (polyvinyl alcohol, titanium dioxide, PEG 3000, talc and FD&C
blue #2). Combinations of atorvastatin with 2.5 mg and 5 mg amlodipine are film
coated white, and combinations of atorvastatin with 10 mg amlodipine are film coated
blue.