Methenamine. Aminoform . Hexamine Silver . Methenamine Silver . Silver Methenamine . Urotropin . Methenamine, Silver . Silver, Hexamine . Silver, Methenamine . Hexamethylenetetramine . Hexamine . AMINOFORM . An anti-infective agent most commonly used in the treatment of urinary tract infections. Its anti-infective action derives from the slow release of formaldehyde by hydrolysis at acidic pH. (From Martindale, The Extra Pharmacopoeia, 30th ed, p173) . 0.50