Charak Samhita
मण्डूरं द्विगुणं चूर्णाद्गोमूत्रे द्व्याढके पचेत्। कोलवद्गुटिकाः कृत्वा तक्रेणालोड्य ना पिबेत्॥९५॥
and forty pala of mandura bhasma (rust of iron) coked in two adhaka of cow’s urine and made in the form of gutika of the size of kola. These pills should be taken with butter milk.
english translation
maNDUraM dviguNaM cUrNAdgomUtre dvyADhake pacet। kolavadguTikAH kRtvA takreNAloDya nA pibet॥95॥
hk transliteration by Sanscript