Table of Contents > Drug > Lorcaserin Print



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    Related terms

      • It is used to help you lose weight.
      • Lorcaserin helps you feel full and eat less.


      How to take

      • Take with or without food.
      • Follow the diet and workout plan that your doctor told you about.

      Missed Dose

      • Take a missed dose as soon as you think about it.
      • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
      • Do not use 2 doses or extra doses.


      • Store at room temperature.
      • Protect from water. Do not store in a bathroom or kitchen.



      • If you have an allergy to lorcaserin or any other part of this drug.
      • Tell your doctor if you are allergic to any drugs. Make sure to tell about the allergy and what signs you had. This includes telling about rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
      • If you are pregnant or may be pregnant.


      • If you have high blood sugar (diabetes), talk with your doctor.
      • If you have heart disease, talk with your doctor.
      • If you have kidney disease, talk with your doctor.
      • If you have liver disease, talk with your doctor.
      • If you have sickle cell disease, talk with your doctor.
      • Check all drugs you are taking with your doctor. This drug may not mix well with some other drugs.
      • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
      • Do not take St John's wort with this drug. This drug may not work as well.
      • Avoid driving and doing other tasks or actions until you see how this drug affects you.
      • Use birth control that you can trust to stop pregnancy while taking this drug.
      • Tell your doctor if you are breast-feeding.

      Side Effects

      • Headache.
      • Dizziness.
      • Upset stomach.
      • Dry mouth. Good mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help. See a dentist often.
      • Hard stools (constipation).
      • Cough.
      • Back pain.
      • Low blood sugar. Signs include anger, shaking, a fast heartbeat, confusion, or sweating. Keep hard candies, glucose tablets, liquid glucose, or juice on hand for low blood sugar.

      Contact a healthcare provider

      • If you think there was an overdose, call your local poison control center or ER right away.
      • Signs of a very bad reaction to the drug. These include wheezing; chest tightness; fever; itching; bad cough; blue or gray skin color; seizures; or swelling of face, lips, tongue, or throat.
      • Trouble breathing.
      • A fast heartbeat.
      • Unsafe or slow heartbeat.
      • Swelling, warmth, or pain in the leg or arm.
      • Signs of low mood (depression), thoughts of killing yourself, nervousness, emotional ups and downs, thinking that is not normal, anxiety, or lack of interest in life.
      • Change in thinking clearly and with logic.
      • Big change in balance.
      • Agitation, twitching, sweating, or muscle stiffness.
      • Signs of low blood sugar.
      • Erection that lasts more than 4 hours.
      • Very upset stomach or throwing up.
      • A big weight loss.
      • Feeling very tired or weak.
      • Any rash.
      • Side effect or health problem is not better or you are feeling worse.

      General Statements

      • If you have a very bad allergy, wear an allergy ID at all times.
      • Do not share your drugs with others and do not take anyone else's drugs.
      • Keep all drugs out of the reach of children and pets.
      • Most drugs may be thrown away in household trash after mixing with coffee grounds or kitty litter and sealing in a plastic bag.
      • In Canada, take any unused drugs to the pharmacy. Also, visit to learn about the right way to get rid of unused drugs.
      • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
      • Call your doctor for help with any side effects. If in the U.S., you may also call the FDA at 1-800-FDA-1088 or if in Canada, you may also call Health Canada's Vigilance Program at 1-866-234-2345.
      • Talk with the doctor before starting any new drug, including OTC, natural products, or vitamins.

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      • Copyright © 1978-2013 Lexi-Comp Inc. All rights reserved.

      Copyright © 2011 Natural Standard (

      The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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