How long has synthroid been on the market?

Q: How long has synthroid been on the market?

Synthroid (levothyroxine sodium) has been on the U.S. market for a little over four decades. Milestone Year Notes First FDA approval of levothyroxine sodium (generic) 1955 The active ingredient—levothyroxine—was approved for treating hypothyroidism, but it was sold under various brand names before Pfizer’s entry. Launch of the Synthroid brand 1983 Pfizer introduced the brand‑name tablet as a 125‑µg dose. It quickly became the most widely recognized levothyroxine product in the U.S. Current status (2024) 41 years From its 1983 debut to today, Synthroid has remained a mainstay for thyroid hormone replacement therapy. So, if you’re looking at the specific Synthroid brand, it’s been available for roughly 41 years (as of 2024). The generic drug, however, has been around a little longer—over 60 years—since its 1955 approval.

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Synthroid (levothyroxine sodium) has been on the U.S. market for a little over four decades.

Milestone	Year	Notes
First FDA approval of levothyroxine sodium (generic)	1955	The active ingredient—levothyroxine—was approved for treating hypothyroidism, but it was sold under various brand names before Pfizer’s entry.
Launch of the Synthroid brand	1983	Pfizer introduced the brand‑name tablet as a 125‑µg dose. It quickly became the most widely recognized levothyroxine product in the U.S.
Current status (2024)	41 years	From its 1983 debut to today, Synthroid has remained a mainstay for thyroid hormone replacement therapy.

So, if you’re looking at the specific Synthroid brand, it’s been available for roughly 41 years (as of 2024). The generic drug, however, has been around a little longer—over 60 years—since its 1955 approval.

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How long has synthroid been on the market?