PHENOBARBITAL AND VACCINES
Influenza vaccine can cause a transient moderate (30%) rise in serum phenobarbital levels. Primidone is metabolised to phenobarbital and may therefore interact similarly.
Warn the patient to monitor for indicators of phenobarbital toxicity (drowsiness, ataxia or dysarthria), and take levels if necessary. Levels may still be moderately raised after 28 days. However, most patients seem unlikely to require dosage adjustments.
Warn the patient to monitor for indicators of phenobarbital toxicity (drowsiness, ataxia or dysarthria), and take levels if necessary. Levels may still be moderately raised after 28 days. However, most patients seem unlikely to require dosage adjustments.