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Variation in prescribing by general practices in England in 2019/2020 for levothyroxine (blue line) and for liothyrinone (orange line). The left hand y‐axis is the percentage of women aged >30 years on levothyroxine, and the right hand y‐axis is the percentage of people on thyroid replacement treatment taking liothyronine. ADDD, annual defined daily dose
