Some of the side effects of this drug are:
Common Side Effects of Belviq (Lorcaserin)
You should tell your doctor if any of the following side effects become severe or don't go away:
Excessive fatigue
Constipation
Dry mouth
Headache
Dizziness
Pain in your back
Muscle pain
Difficulty falling asleep or staying asleep
Cough
Anxiety
Painful, difficult, or frequent urination
Toothache
Dry eyes
Blurred vision or other vision changes
Serious Side Effects of Belviq
Call your doctor immediately if you experience any of the following serious side effects:
Confusion
Coordination difficulties
Agitation
Depression
Suicidal thoughts or actions
Feeling high or unusually happy
Feeling as though you are outside your body
Hallucinations
Restlessness
Difficulty paying attention or remembering information
Muscle spasms, stiffness, or twitching
Fast, slow, or irregular heartbeat
Swelling of your hands, arms, feet, or legs
Sweating
Fever
Nausea, vomiting, or diarrhea
Difficulty breathing
An erection that lasts longer than four hours
Breast discharge
Breast enlargement in males
Interactions:
Bupropion (Aplenzin, Forfivo, Wellbutrin, Zyban)
Cabergoline (Caberlin, Dostinex, Cabaser)
Codeine (in some pain medications and cough medications)
Dextromethorphan (in cough and cold medications)
Flecainide (Tambocor)
Insulin and other medications for diabetes
Linezolid (Zyvox)
Lithium (Lithobid)
Medications for erectile dysfunction
Drugs for mental illness
Medications for migraine headaches, such as almotriptan (Axert), eletriptan (Relpax), frovatriptan (Frova), naratriptan (Amerge, Naramig), rizatriptan (Maxalt), sumatriptan (Imitrex), and zolmitriptan (Zomig)
Other medicines for weight loss
Metoprolol (Toprol)
Mexiletine (Mexitil)
Monoamine oxidase inhibitors (MAOIs), including isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelapar), and tranylcypromine (Parnate)
Odansetron (Zofran)
Propafenone (Rythmol)
Selective serotonin reuptake inhibitors (SSRIs), such as citalopram (Celexa), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, in Symbyax), fluvoxamine (Luvox), paroxetine (Paxil), and sertraline (Zoloft)
Selective serotonin/norepinephrine reuptake inhibitors (SNRIs), such as duloxetine (Cymbalta) and venlafaxine (Effexor)
Tamoxifen (Nolvadex, Soltamox)
Timolol (Blocadren)
Tricyclic antidepressants (TCAs), such as amitriptyline (Elavil), amoxapine (Asendin), clomipramine (Anafranil), desipramine (Norpramin), doxepin (Silenor), imipramine (Tofranil), nortriptyline (Aventyl, Pamelor), protriptyline (Vivactil), and trimipramine (Surmontil)
Tramadol (ConZip, Ultram, Ryzolt, Rybix ODT)
St. John's wort
Tryptophan
It also can cause drowsiness and interfere with your ability to drive.
Yes still could be worth a try if you have no alternative and things like low carb diets don't work for you I suppose.
Still seems to me that they who ever they are, want to push this while warning people off alternatives like LCHF.