The adult daily dose of phenobarbitone is 60 -180 mg. The serum half-life is 24-48 hours and so once daily administration, at night, is usually sufficient.
Phenobarbitone can be given i.m. 200mg repeated after 6 hours if necessary.
For intravenous injection, the drug should be diluted 1 in 10 with water before injection. For comprehensive details on the use of this drug, see BNF 4.8.1.
The summary of product characteristics should be consulted before prescribing this drug.
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