• Andre aktive stoffer såsom cimetidin, ranitidin, procainamid, quinidin, quinin og nikotin, der bruger samme renale kationiske transportsystem som amantadin, kan muligvis også have interaktion med memantin, hvilket kan medføre en risiko for forhøjede plasmaniveauer. • Der er mulighed for en reduktion i serumkoncentrationen af hydrochlorothiazid (HCT), når memantin administreres sammen med HCT eller sammen med kombinationspræparater med HCT. • Efter markedsføringen er der rapporteret enkeltstående tilfælde af stigninger i international normalized ratio (INR) hos patienter i samtidig behandling med warfarin.
There is one published case report on a possible risk also for the combination of memantine and phenytoin. • Other active substances such as cimetidine, ranitidine, procainamide, quinidine, quinine and nicotine that use the same renal cationic transport system as amantadine may also possibly interact with memantine leading to a potential risk of increased plasma levels. • There may be a possibility of reduced serum level of hydrochlorothiazide (HCT) when memantine is co-administered with HCT or any combination with HCT. • In post-marketing experience isolated cases with international normalized ratio (INR) increases have been reported in patients concomitantly treated with warfarin.