The Compendium of Caraka 8.3.18

8.3.18

savyena pārśvena sukhaṃ śayānaṃ kṛtvarjudehaṃ svabhujopadhānam/
&saṅkocya savyetaradasya sakthi vāmaṃ prasārya praṇayettatastam//

lying comfortably on his left side, making his body straight, with his own arm as a pillow,
flexing his right leg and extending the left one, he should then administer it to him.