Belviq vs Qsymia

Belviq Lorcaserin HCL vs Qsymia

Belviq and Qsymia are new drugs for obesity treatment that went on sale in 2012. Both these drugs are appetite suppressants, available for sale only by a prescription. The exact mechanism of action of Belviq and Qsymia is unknown.

The USA is one of the few countries, where both Qsymia and Belviq are sold.

Obese Americans can buy blister or plastic bottles with:

  • Belviq tablets
  • Qsymia capsules

Identical indications for use is the only similarity between Belviq and Qsymia. These drugs belong to different pharmacological groups; therefore, they have so many fundamental differences.

Active ingredients

Each Belviq tablet contains anorexigenic agent Lorcaserin.

Each Qsymia capsule contains anorexigenic agent Phentermine and antiepileptic agent Topiramate.


Belviq drug is produced by Arena Pharmaceuticals

Qsymia drug is produced by Vivus Inc.

Most common side effects

Qsymia – dry mouth, constipation, dizziness, dysgeusia, insomnia and paresthesia.

Belviq – dry mouth, constipation, nausea, cough, headache, back pain and fatigue.


Belviq – pregnancy and hypersensitivity to Lorcaserin.

Qsymia – pregnancy, hyperthyroidism, glaucoma, hypersensitivity to Phentermine and Topiramate.

Qsymia and Belviq can interact with other drugs. Therefore, before including Belviq tablets or Qsymia capsules in a combination medical therapy, patients must read all the information about their drug interactions.

Dose regimen

Belviq – one tablet, 2 times a day

Qsymia – one tablet, once daily

Abuse Liability

Belviq tablets do not contain any controlled substances. Therefore, drug dependence will not develop if you stick to the dose regimen of Belviq drug.

The risk of Belviq abuse may increase if a patient takes more than one weight loss tablet a day.

Qsymia capsules contain the controlled substance, called Phentermine. Even minimal doses of Phentermine may cause drug dependence. Therefore, Qsymia capsules should not be prescribed for obesity therapy in patients, prone to drug addiction.

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1 Comment

  1. I am currently on Belviq, gained about 25#s in the last 2 months. But have the side affects of Belviq, constipation, dry mouth and dizziness. Obviously it did not work for me.

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