13 I en studie med peroralt tillfört 14C- memantin, återfanns i genomsnitt 84% av dosen inom 20 dagar, varvid mer än 99% utsöndrades renalt. ###>In a study using orally administered 14C-memantine, a mean of 84% of the dose was recovered within 20 days, more than 99% being excreted renally.