Meanwhile,
What replace this drug against:
Essential
- The cynomel will no longer be marketed in France from October 31, 2025. Consequently,
- This medication is used in adults and children over 6 years of age to treat hypothyroidies, certain goitles and nodules. Nevertheless,
- To ensure the continuity of treatment of patients, imports of Thybon 20 Henning will be organized. Meanwhile,
The Sanofi laboratory will stop the marketing of cynomel (sodium Liothyronine). However, The judgment of the drug fighting against hypothyroidism will come into force on October 31. Similarly, 2025, according to information transmitted to the National Agency for Medicines Safety (ANSM). In addition, About 3,000 patients are affected.

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Cynomel stop: substitution treatment will be available – What replace this drug against
In its press release of July 17, 2025, the ANSM indicates that it has a solution for patients what replace this drug against who take this medication to treat hypothyroidism, certain goitters or nodules.

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“In anticipation, we have identified an alternative to cynomel: Thybon 20 Henning (Lithyronine chlorhydrate), with a marketing authorization (AMM) in Germany for more than 25 years“Explains the agency. The two drugs are home to the same molecule (Lithyronine), but some excipients divergent.
The Sanofi laboratory is committed to importing this medication into France as soon as its own product is stopped. Imports will be followed by a marketing authorization for Thybon for “Ensure lasting access to this medication “ et. “Avoid patients repeated treatment of treatment”.

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Thybon 20 Henning: a new prescription from your doctor will be necessary
There will be no supply of supply between the end of Cynomel distribution and the arrival of its alternative, assures the ANSM. On the other hand. it will be necessary what replace this drug against to have a prescription from your doctor to obtain boxes of Thybon 20 Henning.
Authorities also warn that an adjustment of the prescribed dose may be necessary. It will also be necessary to carry out thyroid hormone dosages 6 to 8 weeks after the start of treatment. after a change of dosages as well as the appearance or worsening of symptoms (significant variation in weight, signs of a thyroid imbalance, unusual, etc.).
In addition, you will have to be vigilant when the substitution treatment arrives. The latter’s boxes strongly resemble that of another product from Sanofi the L-Thyroxin Henning which contains another type of. synthetic thyroid hormone (levothyroxine). “”We invite pharmacists to educate patients about this risk of confusion. in particular those taking these two treatments simultaneously“Indicates the ANSM.
what replace this drug against
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