Astanga Hrudaya
दद्यादभ्यक्तदेहायै योनौ स्नेहपिचुं ततः। योनिर्मृदुर्भवेत्तेन शूलं चास्याः प्रशाम्यति॥४०॥
Tampon soaked in fat (ghee or oil) should then be inserted into the vagina; by this the vaginal tract becomes soft and her pain subsides.
english translation
dadyAdabhyaktadehAyai yonau snehapicuM tataH। yonirmRdurbhavettena zUlaM cAsyAH prazAmyati॥40॥
hk transliteration by Sanscript