What is Belviq and how is it used?

What is Belviq and how is it used?

Belviq is a prescription medicine used to treat the symptoms of Obesity. Belviq may be used alone or with other medications.

Belviq belongs to a class of drugs called CNS Stimulants, Anorexiants; Serotonin 5-HT2C-Receptor Agonists.

It is not known if Belviq is safe and effective in children.

What is Belviq and how is it used?

What are the possible side effects of Belviq?

Belviq may cause serious side effects including:

  • unusual changes in mood or behavior,
  • thoughts of hurting yourself,
  • dry eyes,
  • blurred vision,
  • feelings of standing next to yourself,
  • memory problems,
  • trouble concentrating,
  • breast swelling,
  • nipple discharge,
  • penis erection that is painful or lasts longer than 4 hours,
  • fast or uneven heart beats,
  • trouble breathing,
  • dizziness,
  • ongoing weakness,
  • swelling in your arms, hands, legs, or feet,
  • agitation,
  • hallucinations,
  • fever,
  • overactive reflexes,
  • nausea,
  • vomiting,
  • diarrhea,
  • loss of coordination,
  • fainting,
  • very stiff (rigid) muscles,
  • high fever,
  • sweating,
  • confusion,
  • tremors, and
  • lightheadedness

Get medical help right away, if you have any of the symptoms listed above.

The most common side effects of Belviq include:

  • headache,
  • dizziness,
  • tiredness,
  • dry mouth,
  • cough,
  • nausea,
  • constipation, and
  • back pain

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of . For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


BELVIQ (lorcaserin hydrochloride) is a serotonin 2C receptor agonist for oral administration used for chronic weight management. Its chemical name is (R)-8-chloro-1-methyl-2,3,4,5-tetrahydro-1H-3- benzazepine hydrochloride hemihydrate. The empirical formula is C11H15Cl2N•0.5H2O, and the molecular weight of the hemihydrate form is 241.16 g/mol. The structural formula is:

BELVIQ (lorcaserin hydrochloride) Structural Formula Illustration

Lorcaserin hydrochloride hemihydrate is a white to off-white powder with solubility in water greater than 400 mg/mL. Each BELVIQ tablet contains 10.4 mg of crystalline lorcaserin hydrochloride hemihydrate, equivalent to 10.0 mg anhydrous lorcaserin hydrochloride, and the following inactive ingredients: silicified microcrystalline cellulose; hydroxypropyl cellulose NF; croscarmellose sodium NF; colloidal silicon dioxide NF, polyvinyl alcohol USP, polyethylene glycol NF, titanium dioxide USP, talc USP, FD&C Blue #2 aluminum lake, and magnesium stearate NF.

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