Potentially hazardous interactions with other drugs
Aminophylline and theophylline: possibly increased
aminophylline and theophylline concentration.
Anaesthetics: enhanced hypotensive effect.
Antibacterials metabolism possibly inhibited by
clarithromycin, erythromycin and telithromycin.
Antidepressants: enhanced hypotensive effect with
MAOIs.
Antiepileptics: effect reduced by carbamazepine,
barbiturates, phenytoin and primidone.
Antifungals: metabolism inhibited by itraconazole
and ketoconazole; negative inotropic effect possibly
increased with itraconazole.
Antihypertensives: enhanced hypotensive effect,
increased risk of first dose hypotensive effect of postsynaptic alpha-blockers.
Antivirals: concentration possibly increased by
ritonavir; use with caution with telaprevir.
Grapefruit juice: concentration increased - avoid
concomitant use.
Tacrolimus: possibly increased tacrolimus
concentration
