August 24, 2016
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Belviq Patient Information Including Side Effects

Brand Names: Belviq

Generic Name: lorcaserin (Pronunciation: lor KAS er in)

What is lorcaserin (Belviq)?

Lorcaserin affects chemicals in the brain that affect appetite.

Lorcaserin is used together with diet and exercise to treat obesity

Lorcaserin is sometimes used to treat obesity that may be related to diabetes, high cholesterol, or high blood pressure.

Lorcaserin will not treat any underlying condition you have (such as heart disease, diabetes, high blood pressure). Keep taking any other medications your doctor has prescribed to treat these conditions.

Lorcaserin may also be used for purposes not listed in this medication guide.

What are the possible side effects of lorcaserin (Belviq)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using lorcaserin and call your doctor at once if you have a serious side effect such as:

  • unusual thoughts or behavior, feelings of extreme happiness or sadness;
  • feelings of standing next to yourself or being outside of your body;
  • thoughts of suicide or hurting yourself;
  • agitation, hallucinations, fever, rapid heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting;
  • very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out;
  • trouble breathing, slow heart rate;
  • feeling short of breath, even with mild exertion;
  • swelling in your hands or feet;
  • pale skin, feeling light-headed or short of breath, trouble concentrating;
  • body aches, flu symptoms, sores in your mouth and throat;
  • low blood sugar (headache, hunger, weakness, sweating, confusion, irritability, dizziness, or feeling jittery);
  • breast swelling (in women or men), nipple discharge; or
  • penis erection lasting longer than 4 hours.

Less serious side effects may include:

  • headache;
  • dizziness, drowsiness, feeling tired;
  • nausea, constipation;
  • dry mouth, cough; or
  • back pain.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the Belviq (lorcaserin hydrochloride) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about lorcaserin (Belviq)?

You should not use lorcaserin if you are allergic to it, or if you are pregnant.

Before you take lorcaserin, tell your doctor if you have diabetes, congestive heart failure, a heart valve disorder, sickle cell anemia, leukemia or myeloma, kidney or liver disease, or a physical deformity of the penis (such as Peyronie's disease).

Weight loss during pregnancy can harm an unborn baby, even if you are overweight. Do not use lorcaserin if you are pregnant.

You should not breast-feed while you are using lorcaserin.

Lorcaserin may be habit-forming and should be used only by the person for whom it was prescribed. Keep the medication in a secure place where others cannot get to it.

Do not take this medication in larger or smaller amounts or for longer than recommended

Tell your doctor if you do not lose at least 5% of your starting weight after taking the medication for 12 weeks.

Lorcaserin is only part of a complete program of treatment that also includes diet, exercise, weight control, and possibly testing your blood sugar.

There are many other drugs that can interact with lorcaserin. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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