Qsymia 7.5-46mg Capsules

Manufacturer VIVUS Active Ingredient Phentermine and Topiramate(FEN ter meen & toe PYRE a mate) Pronunciation FEN ter meen & toe PYRE a mate (Brand: Q-SIM-ee-uh)
It is used to help with weight loss in certain people.
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Drug Class
Anti-obesity agent
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Pharmacologic Class
Sympathomimetic amine (Phentermine); Anticonvulsant, Carbonic Anhydrase Inhibitor (Topiramate)
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Pregnancy Category
Category X
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FDA Approved
Jul 2012
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DEA Schedule
Schedule IV

Overview

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What is this medicine?

Qsymia is a prescription medicine that combines two drugs, phentermine and topiramate, to help adults lose weight and keep it off. It works by helping you feel less hungry and more full, so you eat less. It must be used along with a reduced-calorie diet and increased physical activity.
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How to Use This Medicine

Taking Your Medication

To use this medication correctly, follow your doctor's instructions and read all the information provided. Take your medication as directed, with or without food. To minimize sleep disturbances, avoid taking this medication in the late afternoon or evening.

It's essential to stay hydrated by drinking plenty of non-caffeinated fluids, unless your doctor advises you to limit your fluid intake.

Storing and Disposing of Your Medication

Store your medication at room temperature in a dry location, avoiding the bathroom. Keep the container tightly closed to maintain its effectiveness.

Missing a Dose

If you miss a dose, skip it and resume your regular dosing schedule. Do not take two doses at the same time or take extra doses to make up for the missed one.
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Lifestyle & Tips

  • Follow a reduced-calorie diet as advised by your healthcare provider.
  • Increase your physical activity level regularly.
  • Stay well-hydrated to help prevent kidney stones.
  • Avoid alcohol or use with caution, as it can increase CNS side effects.

Dosing & Administration

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Adult Dosing

Standard Dose: Initial: 3.75 mg phentermine/23 mg topiramate ER once daily for 14 days. Then increase to 7.5 mg phentermine/46 mg topiramate ER once daily. After 12 weeks, if <3% weight loss, consider increasing to 11.25 mg phentermine/69 mg topiramate ER for 14 days, then 15 mg phentermine/92 mg topiramate ER once daily. Discontinue if <5% weight loss after 12 weeks on max dose.
Dose Range: 3.75 - 15 mg

Condition-Specific Dosing:

weightLossTarget: Discontinue if <3% weight loss after 12 weeks on 7.5/46 mg dose, or <5% weight loss after 12 weeks on 15/92 mg dose.
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Pediatric Dosing

Neonatal: Not established
Infant: Not established
Child: Not established
Adolescent: Not established (Safety and efficacy not established in patients under 18 years of age)
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Dose Adjustments

Renal Impairment:

Mild: No adjustment needed (CrCl >50 mL/min)
Moderate: Maximum dose 7.5 mg phentermine/46 mg topiramate ER once daily (CrCl 30-50 mL/min)
Severe: Not recommended (CrCl <30 mL/min)
Dialysis: Not recommended

Hepatic Impairment:

Mild: No adjustment needed (Child-Pugh 5-6)
Moderate: Maximum dose 7.5 mg phentermine/46 mg topiramate ER once daily (Child-Pugh 7-9)
Severe: Not recommended (Child-Pugh 10-15)

Pharmacology

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Mechanism of Action

Qsymia is a combination of phentermine and topiramate extended-release. Phentermine is a sympathomimetic amine that stimulates the release of norepinephrine and dopamine from nerve terminals, and inhibits their reuptake, leading to appetite suppression and increased energy expenditure. Topiramate's exact mechanism for weight loss is not fully understood but is thought to involve multiple actions including potentiation of GABA activity, antagonism of AMPA/kainate glutamate receptors, and inhibition of carbonic anhydrase, which may contribute to satiety and reduced food intake.
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Pharmacokinetics

Absorption:

Bioavailability: Phentermine: ~80%; Topiramate: ~81%
Tmax: Phentermine: 3-4 hours; Topiramate: 6-10 hours (ER formulation)
FoodEffect: Minimal effect on absorption for both components.

Distribution:

Vd: Phentermine: 3.7 L/kg; Topiramate: 0.6-0.8 L/kg
ProteinBinding: Phentermine: 17%; Topiramate: 13-17%
CnssPenetration: Yes

Elimination:

HalfLife: Phentermine: ~20 hours; Topiramate: ~21 hours
Clearance: Phentermine: Primarily renal; Topiramate: Primarily renal
ExcretionRoute: Renal
Unchanged: Phentermine: 60-80%; Topiramate: ~70%
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Pharmacodynamics

OnsetOfAction: Weight loss typically observed within weeks of initiation.
PeakEffect: Maximal weight loss often observed at 24-28 weeks of treatment.
DurationOfAction: Effects persist with continued daily administration.

Safety & Warnings

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Side Effects

Urgent Side Effects: Seek Medical Help Right Away

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek immediate medical attention:

Signs of an allergic reaction: rash, hives, itching, red, swollen, blistered, or peeling skin (with or without fever), wheezing, tightness in the chest or throat, difficulty breathing, swallowing, or talking, unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat.
Signs of acidosis (too much acid in the blood): confusion, rapid breathing, rapid heartbeat, irregular heartbeat, severe stomach pain, nausea, vomiting, excessive sleepiness, shortness of breath, or feeling extremely tired or weak.
Signs of low potassium levels: muscle pain or weakness, muscle cramps, or an irregular heartbeat.
Signs of a urinary tract infection (UTI): blood in the urine, burning or pain while urinating, frequent or urgent need to urinate, fever, lower abdominal pain, or pelvic pain.
Abnormal or rapid heartbeat.
Confusion, difficulty focusing, or changes in behavior.
Memory problems or loss.
Speech difficulties.
Sleep disturbances.
Urination problems (inability to urinate or changes in urine output).
Back pain, abdominal pain, or blood in the urine (may indicate a kidney stone).
Patients taking this medication may be at a higher risk of suicidal thoughts or actions, especially if they have a history of such thoughts or actions. If you experience new or worsening symptoms like depression, anxiety, restlessness, irritability, panic attacks, or mood changes, contact your doctor immediately. If you have suicidal thoughts or actions, seek help right away.
This medication may cause severe eye problems, potentially leading to permanent vision loss if left untreated. If you notice new eye symptoms like blurred vision, changes in vision, eye pain, or eye redness, contact your doctor immediately.
A severe skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis) may occur, causing severe health problems or even death. Seek medical help immediately if you experience symptoms like red, swollen, blistered, or peeling skin (with or without fever), red or irritated eyes, or sores in your mouth, throat, nose, or eyes.

Other Possible Side Effects

Like all medications, this drug may cause side effects in some people. Many individuals may not experience any side effects or only mild ones. If you are bothered by any of the following side effects or if they persist, contact your doctor or seek medical attention:

Headache.
Diarrhea or constipation.
Dry mouth.
Numbness or tingling.
Dizziness, fatigue, or weakness.
Changes in taste.
Nausea or stomach upset.
Common cold symptoms.
Nose or throat irritation.
Back pain.
* Joint pain.

This is not an exhaustive list of possible side effects. If you have questions or concerns about side effects, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
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Seek Immediate Medical Attention If You Experience:

  • Sudden decrease in vision or eye pain (could be acute angle-closure glaucoma, seek immediate medical attention)
  • New or worsening depression, anxiety, or thoughts of self-harm
  • Fast or pounding heartbeat, chest pain, or shortness of breath
  • Numbness or tingling in your hands or feet that is severe or persistent
  • Signs of kidney stones (e.g., severe pain in your side or back, blood in urine)
  • Signs of metabolic acidosis (e.g., feeling tired, loss of appetite, changes in breathing)
  • Memory problems, confusion, or trouble concentrating
  • Fever with sweating, muscle stiffness, or tremors (signs of serotonin syndrome if taken with certain other medications)
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Before Using This Medicine

Before Taking This Medication: Important Information to Share with Your Doctor

It is crucial to inform your doctor about the following:

Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Describe the allergic reaction and its symptoms.
Certain health conditions, including:
+ Glaucoma
+ Overactive thyroid disease
+ Depression or a history of suicidal thoughts
+ Kidney disease
+ Liver disease
Medications you are currently taking, particularly:
+ Acetazolamide, dichlorphenamide, methazolamide, or zonisamide
+ Certain drugs for depression or Parkinson's disease taken in the last 14 days, such as isocarboxazid, phenelzine, tranylcypromine, selegiline, or rasagiline, as they may cause very high blood pressure
+ Linezolid or methylene blue
Pregnancy or potential pregnancy, as this medication should not be taken during pregnancy
Breast-feeding, as you should not breast-feed while taking this medication
The patient's age, especially if they are under 12 years old, as this medication is not approved for use in children younger than 12 years old

This list is not exhaustive, and it is essential to discuss all your medications (prescription, over-the-counter, natural products, and vitamins) and health problems with your doctor and pharmacist to ensure safe use. Never start, stop, or change the dose of any medication without consulting your doctor first.
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Precautions & Cautions

Important Warnings and Cautions

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication.

Caution with Daily Activities
Avoid driving and engaging in activities that require alertness until you understand how this medication affects you.

Monitoring and Follow-up
Regularly check your blood work, blood pressure, and heart rate as instructed by your doctor. Additionally, follow the diet and exercise plan recommended by your doctor.

Stopping the Medication
Do not suddenly stop taking this medication without consulting your doctor, as this may increase your risk of seizures. If you need to stop taking this medication, your doctor will guide you on how to gradually discontinue it.

Interactions with Other Substances
Before consuming alcohol, marijuana, or other forms of cannabis, or taking prescription or over-the-counter medications that may cause drowsiness, discuss the potential risks with your doctor.

Special Considerations for Diabetes and High Blood Pressure
If you have diabetes and take medications to lower your blood sugar, consult your doctor, as weight loss may increase your risk of low blood sugar. Be aware of the signs of low blood sugar, such as dizziness, headache, fatigue, weakness, shaking, rapid heartbeat, confusion, hunger, or sweating, and seek medical attention immediately if you experience any of these symptoms.
Similarly, if you are being treated for high blood pressure, inform your doctor, as weight loss may increase your risk of low blood pressure. Seek medical attention right away if you experience severe dizziness or fainting.

Risk of Metabolic Acidosis
This medication may cause a condition called metabolic acidosis, which can be more likely in children, people with kidney problems, breathing difficulties, or diarrhea. The risk may also be higher if you take certain medications, undergo surgery, or follow a ketogenic diet. Over time, metabolic acidosis can lead to kidney stones, bone problems, or growth issues in children.

Allergy Warning
If you are allergic to tartrazine (FD&C Yellow No. 5), inform your doctor, as some products contain this ingredient.

Heat-Related Risks
Be cautious in hot weather and during physical activity, as this medication can cause decreased sweating and high body temperature, which may require hospitalization. Seek medical attention immediately if you experience a fever or decreased sweating during activities or in warm temperatures.

Effects on Growth and Menstrual Cycle
In some cases, this medication may affect growth in children and teenagers, and they may require regular growth checks. Additionally, if you take birth control, your menstrual bleeding may change while taking this medication. Inform your doctor if you experience any changes.

Pregnancy and Birth Control
A pregnancy test will be conducted before starting and during treatment with this medication to ensure you are not pregnant. The risk of birth defects is higher if this medication is taken during pregnancy, and the baby may be smaller at birth. Although the long-term effects are unknown, it is essential to use birth control while taking this medication to prevent pregnancy. If you become pregnant, inform your doctor immediately.
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Overdose Information

Overdose Symptoms:

  • Restlessness, tremor, hyperreflexia, rapid breathing
  • Confusion, hallucinations, panic states
  • Hyperpyrexia (very high fever)
  • Arrhythmias, hypertension or hypotension, circulatory collapse
  • Seizures, coma
  • Severe metabolic acidosis, hypokalemia (from topiramate component)

What to Do:

Seek immediate medical attention. Call 911 or Poison Control at 1-800-222-1222. Management is primarily supportive, including gastric lavage, activated charcoal, and symptomatic treatment for cardiovascular and CNS effects. Hemodialysis may be effective for topiramate overdose.

Drug Interactions

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Contraindicated Interactions

  • Monoamine Oxidase Inhibitors (MAOIs) within 14 days (risk of hypertensive crisis)
  • Patients with glaucoma
  • Patients with hyperthyroidism
  • Patients with unstable heart disease or advanced arteriosclerosis
  • Patients with a history of drug abuse
  • Pregnancy
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Major Interactions

  • Central Nervous System (CNS) Depressants (e.g., alcohol, benzodiazepines, barbiturates): Increased risk of CNS depression.
  • Other Sympathomimetic Amines (e.g., other appetite suppressants, decongestants): Increased risk of cardiovascular and CNS adverse effects.
  • Carbonic Anhydrase Inhibitors (e.g., acetazolamide, zonisamide): Increased risk of metabolic acidosis and kidney stones.
  • Oral Contraceptives: Topiramate may decrease the efficacy of estrogen-containing oral contraceptives, leading to breakthrough bleeding and potential for unintended pregnancy.
  • Antidiabetic Agents (e.g., insulin, sulfonylureas): Weight loss may improve glycemic control, requiring dose adjustments of antidiabetic medications.
  • Non-potassium-sparing diuretics (e.g., hydrochlorothiazide): May exacerbate hypokalemia and metabolic acidosis.
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Moderate Interactions

  • Digoxin: Topiramate may decrease digoxin levels.
  • Lithium: Topiramate may alter lithium levels.
  • Valproic Acid: Concomitant use with topiramate has been associated with hyperammonemia with or without encephalopathy.
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Minor Interactions

  • Not many specific minor interactions are consistently cited; general caution with other CNS-active drugs.

Monitoring

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Baseline Monitoring

Pregnancy Test

Rationale: Qsymia is contraindicated in pregnancy due to teratogenic risk (oral clefts).

Timing: Prior to initiation in females of reproductive potential.

Serum Electrolytes (Bicarbonate)

Rationale: Topiramate can cause metabolic acidosis.

Timing: Prior to initiation.

Renal Function (CrCl)

Rationale: Dose adjustment required for renal impairment; drug is renally eliminated.

Timing: Prior to initiation.

Heart Rate and Blood Pressure

Rationale: Phentermine can increase heart rate and blood pressure.

Timing: Prior to initiation.

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Routine Monitoring

Pregnancy Test

Frequency: Monthly

Target: Negative

Action Threshold: Discontinue immediately if pregnancy occurs.

Serum Bicarbonate

Frequency: Periodically during treatment

Target: Within normal limits

Action Threshold: If persistent decrease below normal range, consider dose reduction or discontinuation.

Heart Rate

Frequency: Periodically during treatment

Target: Within normal limits or patient's baseline

Action Threshold: If sustained increase in resting heart rate, consider dose reduction or discontinuation.

Blood Pressure

Frequency: Periodically during treatment

Target: Within normal limits or patient's baseline

Action Threshold: If sustained increase in blood pressure, consider dose reduction or discontinuation.

Weight

Frequency: Periodically (e.g., every 4 weeks)

Target: Achieve and maintain weight loss goals

Action Threshold: Discontinue if insufficient weight loss (e.g., <3% at 12 weeks on 7.5/46mg, or <5% at 12 weeks on 15/92mg).

Mental Status/Mood

Frequency: Periodically

Target: Stable mood, absence of suicidal ideation

Action Threshold: Monitor for new or worsening depression, anxiety, or suicidal thoughts; discontinue if severe or persistent.

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Symptom Monitoring

  • Symptoms of metabolic acidosis (e.g., fatigue, anorexia, rapid breathing, cardiac arrhythmias)
  • Symptoms of kidney stones (e.g., flank pain, hematuria, dysuria)
  • Symptoms of acute myopia and secondary angle-closure glaucoma (e.g., sudden decreased vision, eye pain, redness)
  • Psychiatric symptoms (e.g., depression, anxiety, insomnia, suicidal ideation)
  • Cardiovascular symptoms (e.g., palpitations, chest pain, shortness of breath, dizziness, syncope)
  • Cognitive impairment (e.g., difficulty concentrating, memory problems, word-finding difficulties)
  • Numbness or tingling in extremities (paresthesia)

Special Patient Groups

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Pregnancy

Qsymia is contraindicated in pregnancy (Pregnancy Category X). It can cause fetal harm, specifically oral clefts (cleft lip and/or cleft palate), when administered during the first trimester. Females of reproductive potential must have a negative pregnancy test before starting treatment and use effective contraception during therapy.

Trimester-Specific Risks:

First Trimester: High risk of oral clefts (cleft lip and/or cleft palate) in infants exposed to topiramate.
Second Trimester: Potential for other adverse developmental outcomes, though less data than first trimester.
Third Trimester: Potential for withdrawal symptoms in neonates if exposed to phentermine near term; metabolic acidosis in neonates from topiramate.
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Lactation

Not recommended during breastfeeding. Both phentermine and topiramate are excreted into human milk. Potential for serious adverse reactions in breastfed infants, including irritability, poor feeding, sedation, and metabolic acidosis.

Infant Risk: High (L4)
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Pediatric Use

Safety and efficacy have not been established in pediatric patients (under 18 years of age). Not approved for use in this population.

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Geriatric Use

Use with caution in elderly patients (â‰Ĩ65 years of age) due to a greater likelihood of decreased renal function and increased sensitivity to adverse effects (e.g., cardiovascular, CNS). Start at the lower end of the dosing range and monitor renal function.

Clinical Information

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Clinical Pearls

  • Qsymia is part of a Risk Evaluation and Mitigation Strategy (REMS) program due to the teratogenic risk (oral clefts) associated with topiramate. Prescribers must be certified and pharmacies must be certified to dispense Qsymia.
  • Gradual titration of the dose is crucial to minimize side effects, especially those related to topiramate (e.g., paresthesia, cognitive impairment, mood changes).
  • Discontinuation of Qsymia should be gradual to avoid potential withdrawal symptoms (e.g., seizures in patients with a history of seizures, or increased frequency of seizures in those without, from topiramate).
  • Patients should be advised to stay well-hydrated to reduce the risk of kidney stone formation.
  • Monitor for signs of metabolic acidosis, especially in patients with predisposing conditions (e.g., renal disease, severe respiratory disorders, diarrhea, ketogenic diet).
  • Counsel patients on the importance of effective contraception throughout treatment due to the severe teratogenic risk.
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Alternative Therapies

  • Liraglutide (Saxenda)
  • Semaglutide (Wegovy)
  • Naltrexone/Bupropion (Contrave)
  • Orlistat (Xenical, Alli)
  • Phentermine (Adipex-P, Lomaira) - monotherapy
  • Bariatric surgery
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Cost & Coverage

Average Cost: $150 - $250 per 30 capsules (approximate)
Insurance Coverage: Tier 2 or 3 (often requires prior authorization and/or step therapy for obesity management)
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General Drug Facts

If your symptoms or health issues persist or worsen, it is essential to contact your doctor promptly. To ensure safe use, never share your medication with others, and do not take medication prescribed to someone else. This medication is accompanied by a Medication Guide, which provides crucial information for patients. Please read this guide carefully and review it again whenever you receive a refill of this medication. If you have any questions or concerns about this medication, consult your doctor, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek emergency medical attention. When seeking help, be prepared to provide details about the overdose, including the medication taken, the amount, and the time it occurred.