Charak Samhita
आस्यादामाशयस्थान् हि रोगान् नस्तःशिरोगतान् । गुदात् पक्वाशयस्थांश्च हन्त्याशु दत्तमौषधम् ॥२९४॥
॥ Routes of administration of medicine॥ If the doshas are located in stomach, then medicines shall be administered orally; if at head region, then through nose; and if at colon then medicines quickly act if given per rectum.
english translation
AsyAdAmAzayasthAn hi rogAn nastaHzirogatAn । gudAt pakvAzayasthAMzca hantyAzu dattamauSadham ॥294॥
hk transliteration by Sanscript