Reddit mentions of McGraw-Hill Education Complete Medical Spanish: Practical Medical Spanish for Quick and Confident Communication

These comments are pretty dramatic. Don't be discouraged by them. I'm in medical school and have been slowly learning Spanish for the past year and have plans for a 7 week immersion this summer in Latin America. My school actively encourages learning Spanish, provides a few courses, and even has the city's only Spanish clinic on campus. Not everything you say is going to kill your patient, and it will be that much better of a medical professional-patient relationship if you are at least attempting to communicate with them in a language they understand! You just need to know the limits and when to wait for a translator, that's all.

I've got a variety of texts laying around but the one specifically for medical spanish is this one. I don't really find it useful for learning Spanish grammar, you need other books for that, but I think it does a great job of going through very specific situations and giving vocab and example dialog.

Good luck!