Millions of people with hypothyroidism depend on levothyroxine every day to replace the thyroid hormone their body cannot produce. Now, the U.S. Food and Drug Administration (FDA) has announced a nationwide recall of certain batches of levothyroxine sodium tablets after they were found to be subpotent, meaning they contain less active medication than stated on the label. Experts caution that ingesting a lower-than-prescribed dose could allow hypothyroidism symptoms to return, particularly in vulnerable groups like pregnant women, infants, and people with thyroid cancer.Why Did FDA Recall Levothyroxine?The FDA has issued a Class II recall for specific lots of levothyroxine sodium tablets distributed by Major Pharmaceuticals. Testing found that the recalled tablets were below the approved potency specification, meaning they may not deliver the intended amount of thyroid hormone. The recall affects multiple strengths packaged in 100-tablet cartons and 10-count blister packs. Dosages involved include 25 mcg, 50 mcg, 75 mcg, 88 mcg, 112 mcg, 125 mcg and 150 mcg. The FDA has categorized the action as a Class II recall. According to the agency, a Class II recall means: "Use of, or exposure to, a violative product may cause temporary or medically reversible adverse health consequences or where the probability of serious adverse health consequences is remote." This means the recall is important but does not come under FDA's highest-risk category.Also read: Is Your Allergy Medicine Safe? FDA Recalls Antihistamine Tablets Over Life-Threatening Contamination ConcernsWhy A Subpotent Thyroid Medicine A Concern?Even relatively small differences in levothyroxine dose can affect how well the medicine works. If they contain less hormone than needed, patients may receive insufficient thyroid replacement. Possible consequences include:FatigueWeight gainFeeling unusually coldConstipationDepression or low moodBrain fogDry skinSlower heart rateIn some higher-risk individuals, inadequate thyroid hormone replacement could have more severe consequences, including worsening hypothyroidism or interference with thyroid cancer treatment.Also read: CDC's 'Vaccines Do Not Cause Autism' Webpage Sparks Debate; Republican Senator Seeks Clarity What Does This Recall Mean For Patients?Levothyroxine is the synthetic form of thyroxine (T4), a hormone normally produced by the thyroid gland. Doctors prescribe it to treat hypothyroidism, goiter, certain thyroid cancers after surgery, and conditions requiring suppression of thyroid-stimulating hormone (TSH) Because thyroid hormone influences nearly every organ system, taking the correct dose consistently is essential.Also read: Montelukast Mental Health Warning Still Largely Overlooked By PsychiatristsDo not stop taking levothyroxine on your own. Stopping thyroid medication suddenly can lead to worsening hypothyroidism and other complications. Instead, patients should:Check whether their medication's lot number matches the recalled batches.Contact your pharmacist or physician.Obtain a replacement if their medication is affected.Continue treatment unless instructed otherwise by a healthcare professional. Other Recently Recalled MedicationsThe FDA also announced recently that it is recalling four lots of Cetirizine Hydrochloride Tablets USP 5 mg made by India-based company Unique Pharmaceutical Laboratories due to potential cross-contamination with ranitidine, a medication used to treat heartburn and stomach ulcers.Although Unique Pharmaceutical Laboratories said it has not received any reports of adverse reactions related to the recalled tablets, the contamination could pose a serious risk for people who are allergic or hypersensitive to ranitidine.The latest FDA recall serves as a reminder that quality control remains critical for medications taken every day. For anyone taking levothyroxine, experts recommend checking medication packaging against the FDA recall notice and speaking with a healthcare provider or pharmacist if there is any uncertainty.