Children who are prescribed puberty blockers to treat precocious puberty typically take the medication until they're at least 8 or 9 years old. There are cases of people presenting with signs of precocious puberty as young as 1 year old who then use this medication for 7 or more years, explains Osipoff.

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https://www.healthline.com/health/are-puberty-blockers-reversible#benefits