What was the 'medicine' Baba gave to Amir Shakkar for his rheumatism, and how was it administered?

The source material in Chapter 22 reveals that the only medicine Baba provided to Amir Shakkar for his rheumatism was "His word." There was no physical remedy offered. Baba's firm instruction to Amir was to disregard the harsh conditions of the Chavadi—the wind, rain, and dampness—and not to weigh them in his mind. The administration of this 'medicine' was through Amir's complete acceptance of Baba's command and his faith. By staying there happily and treating Sai's word as the ultimate cure, his faith was the true healing agent.