Search Type: drug or dietary supplement name
Search Term: levothyroxine (LEVO-T, LEVOTHYROID, LEVOXYL, NOVOTHYROX, SYNTHROID, THYRO-TABS, TIROSINT, UNITHROID)


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  • Thyroid Hormone [hide all summaries]
    Variations in the amount of active levothyroxine available in a tablet can affect both the safety and effectiveness of the drug. Levothyroxine is unstable in the presence of light, temperature, air, and humidity. Patients who receive superpotent tablets (too much levothyroxine) experience chest pain, rapid heart rate, or heart rhythm disturbances. There is also evidence that overtreatment can cause the bone-weakening disease osteoporosis. Subpotent (too little levothyroxine) tablets will not be effective in controlling the symptoms of low thyroid hormone production (hypothyroid).

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