The spelling of the word "joha" can be a bit tricky since it's pronounced differently than it looks. In IPA (International Phonetic Alphabet) transcription, "joha" is spelled as /dʒoʊˈhɑː/. The sound represented by "j" is a voiced palato-alveolar affricate, which is similar to a "ch" sound but further forward in the mouth. The "oh" is pronounced as a long open-o sound, like in the word "boat." The final "a" is pronounced as a long, unrounded ah sound, like in "father." So, when you see "joha," remember that it's actually pronounced as "JOH-hah."
A suspension of salvarsan in iodipin and anhydrous lanolin.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.