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Mean serum concentration-time curves of a) intravenously (10 mg d7-S/R-verapamil) and b) orally (120 mg d0-S/R-verapamil) administered verapamil before (day 4; • S-verapamil, ▴ R-verapamil) and during (day 16, ○ S-verapamil; ▵ R-verapamil) treatment of eight older subjects with rifampicin. No evening dose of oral verapamil was administered on day 4 and day 16
