Interactions with other drugs
No studies of interaction with other medicinal products have been performed.
Methylxanthines (e.g., caffeine and theophylline) are non-specific adenosine receptor antagonists and may interfere with the vasodilation activity of regadenoson. Patients should avoid consumption of any products containing methylxanthines as well as any medicinal products containing theophylline for at least 12 hours before Rapiscan administration.
Aminophylline has been used to attenuate adverse reactions to Rapiscan.
Dipyridamole increases blood adenosine levels and the response to regadenoson may be altered when blood adenosine levels are increased. When possible, dipyridamole should be withheld for at least two days prior to Rapiscan administration.
Cardioactive medicinal products
In clinical studies, Rapiscan was administered to patients taking other cardioactive medicinal products (i.e., β-blockers, calcium channel blockers, ACE inhibitors, nitrates, cardiac glycosides, and angiotensin receptor blockers) without apparent effects on the safety or efficacy profile of Rapiscan.
Regadenoson does not inhibit the metabolism of substrates for CYP1A2, CYP2C8, CYP2C9, CYP2C19, CYP2D6, or CYP3A4 in human liver microsomes, indicating that it is unlikely to alter the pharmacokinetics of medicinal products metabolised by these cytochrome P450 enzymes.