|Formulation in Pharmacy Practice 2nd Edition|
Nifedipine is practically insoluble in water and is extremely light sensitive. Preparation of a mixture from tablets or by dilution of the contents of capsules is not recommended.
Sublingual absorption of nifedipine is incomplete and unreliable, and much of the dose is actually swallowed and absorbed in the normal way.1,2 The use of sublingual nifedipine for rapid control of hypertension is no longer generally recommended and alternative agents are available.
The removal of nifedipine liquid from capsules with a needle and syringe can lead to very erratic and variable dose administration.3 It is impossible to withdraw all the liquid.4 If the concentration of nifedipine in the capsule is known, it is easier to withdraw the required volume from
The successful use of rectal nifedipine in young children with acute hypertension has been described.5 The total amount of drug and the volume in the capsule were determined (obtained from manufacturer's data), and the extra contents were removed with a syringe leaving the required dose in the capsule. A second hole was made in the capsule, which was then given rectally.
Helin et al6 investigated the preparation of nifedipine powders manufactured in a dimly lit room and then sealed in wax paper. Tablets were crushed and diluted with lactose
Formulation in Pharmacy Practice