Meditron is an open-source suite of medical large language models (LLMs). It adapts Llama-2 to the medical domain by continuously pre-training it on a curated medical corpus, including selected PubMed papers and abstracts, a new internationally recognized medical guidelines dataset, and a general domain corpus. Meditron-70B has been fine-tuned on relevant data and outperforms Llama-2-70B, GPT-3.5, and Flan-PaLM on related benchmarks.