
New version of drug causing serious side effects, say users.
A free helpline number (French only) has been set up to assist thyroid patients in France concerned by side effects from taking a revised version of the drug Levothyrox.
The drug is among the most prescribed in France, with three million users with thyroid problems or cancer.
Doctors and health authorities have tried to reassure patients about the new drug. Professor Jean-Christophe Lifante, thyroid specialist at Lyon-Sud hospital, told Le Parisien: "There may be side effects on some patients, but we must calm the controversy because the majority of them are only temporary."
The National Agency for the Safety of Medicines (ANSM), which set up the helpline, said "the new formula has been demonstrated to be bioequivalent to the old formula" and that "this bioequivalence is the guarantee of identical effectiveness and safety".
However, many users are not convinced by ANSM's claims and say they have had serious side effects since the drug was first marketed at the end of March. These include dizzyness, headaches, memory loss, extreme fatigue and worse."We are facing a major crisis," said Chantal L'Hoir, founder of the AFMT (French Association of Thyroid Patients).
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