Excedrin rhymes with:
audran, cauldron, chadron, children, condron, gendron, grandchildren, hendron, hydron, kindran, madron, octahedron, padron, philodendron, polyhedron, ravindran, rhododendron, schoolchildren, squadron, stepchildren, tetrahedron, vorndran, waldren, waldron
Excedrin sounds like:
eastern, eckstrom, ecuadoran, ecuadorean, ecuadorian, ekaterina, ekstrom, equestrian, estrin, extreme, eyestrain