zhēn wǔ tāng • true warrior decoction • 真武汤 warm the interior fù zi is used for patterns with interior cold due to yang deficiency. symptoms indicating the use of fù zi diarrhea, undigested food in stools, cold extremities, sweating, cold sweats, dizziness, weak breathing, palpitations, weak back and legs, impotence, low libido, urinary frequency, dysmenorrhea.…