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itemtype="http://schema.org/ListItem"> <a href="https://medlineplus.gov" itemprop="item"><span itemprop="name">Home</span></a> → <meta itemprop="position" content="1"/> </div> <div itemscope itemprop="itemListElement" itemtype="http://schema.org/ListItem"> <a href="https://medlineplus.gov/druginformation.html" itemprop="item"><span itemprop="name">Drugs, Herbs and Supplements</span></a> → <meta itemprop="position" content="2"/> </div> </div><div><span>Thiamine (Vitamin B1) </span></div></div><span class="page-url print-only">URL of this page: https://medlineplus.gov/druginfo/meds/a682586.html</span><article><div class="page-info"><div class="page-title"><a name="start" id="start"> </a><h1 class="with-also">Thiamine (Vitamin B1) </h1><span class="alsocalled" id="d-pronunciation">pronounced as (thye' a min) </span> </div><div class="page-actions"> </div> <noscript><span class="js-disabled-message">To use the sharing features on this page, please enable JavaScript.</span></noscript></div><div id="toc-box"><ul role="navigation" class="group"><li><a href="#why">Why is this medication prescribed?</a> </li><li><a href="#how">How should this medicine be used?</a> </li><li><a href="#other-uses">Other uses for this medicine</a> </li><li><a href="#precautions">What special precautions should I follow?</a> </li><li><a href="#special-dietary">What special dietary instructions should I follow?</a> </li><li><a href="#if-i-forget">What should I do if I forget a dose?</a> </li><li><a href="#side-effects">What side effects can this medication cause?</a> </li><li><a href="#storage-conditions">What should I know about storage and disposal of this medication?</a> </li><li><a href="#overdose">In case of emergency/overdose</a> </li><li><a href="#other-information">What other information should I know?</a> </li></ul></div><section><div id="why" class="section"><div class="section-header"><div class="section-title"><h2>Why is this medication prescribed?</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-1"><p>Thiamine (vitamin B<sub>1</sub>) is used as a dietary supplement when the amount of thiamine in the diet is not enough. People most at risk for thiamine deficiency are older adults, those who are dependent on alcohol, or who have HIV/AIDS, diabetes, malabsorption syndrome (problems absorbing food), or have had bariatric surgery (an operation that helps you lose weight by making changes to your digestive system). Thiamine is used to treat beriberi (tingling and numbness in feet and hands, muscle loss, and poor reflexes caused by a lack of thiamine in the diet) and to treat and prevent Wernicke-Korsakoff syndrome (tingling and numbness in hands and feet, memory loss, confusion caused by a lack of thiamine in the diet). Thiamine is in a class of medications called vitamins. It is needed by the body to turn foods into energy, which is important for the growth, development, and function of cells.</p></div></div></section><section><div id="how" class="section"><div class="section-header"><div class="section-title"><h2>How should this medicine be used?</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-2"><p>Thiamine comes as a tablet, capsule, and solution (liquid drops) to take by mouth. It is usually taken once to three times a day depending on the preparation, your age, and your medical condition(s). Thiamine is available without a prescription, but your doctor may prescribe thiamine to treat certain conditions. Follow the directions on your product label or doctor's instructions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take thiamine exactly as directed. Do not take more or less of it or take it more often than recommended by your doctor.</p><p>Thiamine supplements are available alone and in combination with other vitamins.</p></div></div></section><section><div id="other-uses" class="section"><div class="section-header"><div class="section-title"><h2>Other uses for this medicine</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-3"><p>This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.</p></div></div></section><section><div id="precautions" class="section"><div class="section-header"><div class="section-title"><h2>What special precautions should I follow?</h2></div><div class="section-button"><button type="submit" aria-controls="section-precautions" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-precautions"><h3>Before taking thiamine,</h3><ul><li>tell your doctor and pharmacist if you are allergic to thiamine, any other medications, or any of the ingredients in thiamine products. Ask your pharmacist for a list of the ingredients.</li><li>tell your doctor if you drink alcohol or if you have problems absorbing food or if you are receiving dialysis treatments.</li><li>tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.</li><li>tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking thiamine, call your doctor.</li></ul></div></div></section><section><div id="special-dietary" class="section"><div class="section-header"><div class="section-title"><h2>What special dietary instructions should I follow?</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-5"><p>Unless your doctor tells you otherwise, continue your normal diet.</p></div></div></section><section><div id="if-i-forget" class="section"><div class="section-header"><div class="section-title"><h2>What should I do if I forget a dose?</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-6"><p>Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.</p></div></div></section><section><div id="side-effects" class="section"><div class="section-header"><div class="section-title"><h2>What side effects can this medication cause?</h2></div><div class="section-button"><button type="submit" aria-controls="section-side-effects" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-side-effects"><h3>Thiamine may cause side effects. Tell your doctor if either of these symptoms is severe or does not go away: </h3><ul><li>flushing</li><li>hives</li><li>itching</li><li>weakness</li><li>sweating</li><li>nausea</li><li>restlessness</li></ul><p>Thiamine may cause other side effects. Call your doctor if you have any unusual problems while taking this vitamin.</p><p>If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (<a target="_blank" href="https://www.fda.gov/Safety/MedWatch">https://www.fda.gov/Safety/MedWatch</a>) or by phone (1-800-332-1088).</p></div></div></section><section><div id="storage-conditions" class="section"><div class="section-header"><div class="section-title"><h2>What should I know about storage and disposal of this medication?</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-8"><p>Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).</p><p>It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location — one that is up and away and out of their sight and reach. <a target="_blank" href="https://www.upandaway.org">https://www.upandaway.org</a></p><p>Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website (<a target="_blank" href="https://goo.gl/c4Rm4p">https://goo.gl/c4Rm4p</a>) for more information if you do not have access to a take-back program.</p></div></div></section><section><div id="overdose" class="section"><div class="section-header"><div class="section-title"><h2>In case of emergency/overdose</h2></div><div class="section-button"><button type="submit" aria-controls="section-9" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-9"><p>In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at <a target="_blank" href="https://www.poisonhelp.org/help">https://www.poisonhelp.org/help</a>. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.</p></div></div></section><section><div id="other-information" class="section"><div class="section-header"><div class="section-title"><h2>What other information should I know?</h2></div><div class="section-button"><button type="submit" aria-controls="section-10" role="button" title="Expand/Collapse section"><span class="icon icon-section-action"> </span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite"> </div></div><div class="section-body" id="section-10"><p>Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your response to thiamine.</p><p>Before having any laboratory test, tell your doctor and the laboratory personnel that you are taking thiamine.</p><p>Ask your pharmacist any questions you have about thiamine.</p><p>It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.</p></div></div></section><span>Last Revised - </span><span>10/15/2020</span> </p> <div id="bdme"><a href="https://medlineplus.gov/druginformation.html">Browse Drugs and Medicines</a></div><div id="citation-how-to"><button><span>Learn how to cite this page</span></button></div></article></div><footer><div class="provider-box"><img src="https://medlineplus.gov/images/ashpTM_CMYK_small.jpg" alt="ASHP Logo" title="ASHP Logo"/><a href="https://medlineplus.gov/ashpdisclaimer.html">American Society of Health-System Pharmacists, Inc. Disclaimer</a><div><p>AHFS<sup>®</sup> Patient Medication Information™. © Copyright, 2024. The American Society of Health-System Pharmacists<sup>®</sup>, 4500 East-West Highway, Suite 900, Bethesda, Maryland. All Rights Reserved. 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