Maximum phentermine dosage

Phentermine is a prescription drug that is commonly used as an appetite suppressant, which aids in weight loss. It is usually prescribed for individuals who are obese or overweight and have other health conditions such as hypertension, diabetes, or high cholesterol. Phentermine works by stimulating the central nervous system, which reduces hunger and increases metabolism. However, phentermine is not a magic pill; it only works when combined with a healthy diet and regular exercise. In this article, we will discuss the maximum phentermine dosage and its effects on the body.

Phentermine Dosage

Phentermine is available in various forms, including tablets, capsules, and extended-release capsules. The dosage of phentermine depends on several factors such as age, weight, medical history, and other medications taken by the patient. The typical starting dose is 15mg or 30mg once daily before breakfast. The maximum dose is 37.5mg per day. However, some doctors may prescribe a higher dosage if deemed necessary.

Factors Affecting Phentermine Dosage


Older patients may be more sensitive to the effects of phentermine, and therefore, may require a lower dosage.


The dosage of phentermine is often based on the patient's weight. Heavier patients may require a higher dosage to achieve the desired effect.

Medical History

Patients with certain medical conditions such as heart disease, high blood pressure, or diabetes may require a lower dosage of phentermine. Patients with liver or kidney disease may also need a lower dosage or may not be able to take phentermine at all.

Other Medications

Patients taking other medications that affect the central nervous system such as antidepressants, antipsychotics, or stimulants may require a lower dosage of phentermine.

Side Effects of Phentermine

Phentermine can cause several side effects, including:

  • Dry mouth
  • Insomnia
  • Dizziness
  • Irritability
  • Headache
  • Nausea or vomiting
  • Constipation
  • Increased heart rate or blood pressure
  • Shortness of breath
  • Chest pain
  • Blurred vision

If any of these side effects persist or worsen, patients should contact their doctor immediately. In rare cases, phentermine can cause serious side effects such as:

  • Severe allergic reactions
  • Heart palpitations
  • Psychosis or hallucinations
  • Seizures
  • Stroke
  • Death (very rare)

Precautions When Taking Phentermine

Patients taking phentermine should follow these precautions:

  • Do not take phentermine if allergic to it or any of its ingredients.
  • Inform your doctor of any medical conditions you have or medications you are taking.
  • Do not take phentermine if pregnant or breastfeeding.
  • Avoid alcohol while taking phentermine.
  • Avoid driving or operating heavy machinery until you know how phentermine affects you.
  • Avoid taking phentermine late in the day as it may cause insomnia.
  • Do not crush or chew extended-release capsules.
  • Do not abruptly stop taking phentermine as it may cause withdrawal symptoms.

The Bottom Line

Phentermine is an effective appetite suppressant that can aid in weight loss when combined with a healthy diet and regular exercise. The maximum dosage of phentermine is 37.5mg per day. Patients taking phentermine should follow precautions and be aware of potential side effects. If you are considering taking phentermine, consult with your doctor to determine if it is right for you.

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