what are doses of phentermine
what are doses of phentermine

What are the Available Phentermine Dosages?

Phentermine is a well-known prescription medication used to aid weight loss in individuals who are obese or have weight-related medical problems. As a weight loss clinic, it's essential to provide comprehensive information about the available dosages of phentermine to help potential patients understand their options and make informed decisions. This article will delve into the different dosages of phentermine, how it works, its effectiveness, and the importance of proper medical supervision.

Understanding Phentermine

Phentermine is an appetite suppressant that affects the central nervous system, similar to amphetamines. It is typically prescribed as a short-term solution to assist in weight loss by reducing hunger and making it easier to stick to a reduced-calorie diet. Phentermine is usually recommended for individuals with a body mass index (BMI) of 30 or higher, or 27 or higher if they have other risk factors like hypertension, diabetes, or high cholesterol.

Available Phentermine Dosages

Phentermine comes in various dosages to cater to different needs and responses of patients. The dosages typically range from 8 mg to 37.5 mg, and it's available in both tablet and capsule forms. Here’s a breakdown of the common dosages:

1. 8 mg (Lomaira)

  • Usage: Usually taken three times a day, 30 minutes before meals.

  • Pros: Lower dosage minimizes potential side effects and is suitable for patients sensitive to higher doses.

  • Cons: Requires multiple doses throughout the day, which can be inconvenient for some patients.

2. 15 mg

  • Usage: Generally taken once a day, in the morning.

  • Pros: Convenient single daily dose, lower risk of side effects compared to higher dosages.

  • Cons: May not be effective for all patients, particularly those with a higher level of obesity.

3. 18.75 mg

  • Usage: Can be taken once daily or split into two doses.

  • Pros: Flexible dosing schedule, allows for adjustment based on patient’s response.

  • Cons: Intermediate dosage might not provide the desired appetite suppression for everyone.

4. 30 mg

  • Usage: Typically taken once a day, in the morning.

  • Pros: Effective for many patients with moderate obesity, convenient once-daily dosing.

  • Cons: Higher risk of side effects such as increased heart rate and insomnia.

5. 37.5 mg

  • Usage: Usually taken once a day, in the morning.

  • Pros: Most commonly prescribed dose, effective for significant appetite suppression.

  • Cons: Highest risk of side effects, not suitable for all patients.

How Phentermine Works

Phentermine works by stimulating the release of neurotransmitters in the brain that control appetite. Specifically, it increases the levels of norepinephrine, a chemical that signals a fight-or-flight response, which in turn reduces hunger. Additionally, phentermine may also increase the release of serotonin and dopamine, which help regulate mood and appetite.

The medication helps patients feel full more quickly, reducing the urge to overeat. By assisting with appetite control, phentermine can make it easier for patients to adhere to a calorie-restricted diet, leading to weight loss.

Effectiveness of Phentermine

Phentermine has been shown to be effective in promoting weight loss when combined with a proper diet and exercise regimen. Studies have indicated that individuals taking phentermine can experience a significant reduction in body weight compared to those who do not take the medication.

Clinical Studies and Results

  • Short-Term Use: A study published in the journal Obesity found that individuals taking phentermine lost an average of 3.6 kg (approximately 8 pounds) over a 12-week period.

  • Long-Term Use: Although phentermine is generally prescribed for short-term use (up to 12 weeks), some studies have examined its long-term efficacy. One study published in The Journal of Clinical Endocrinology & Metabolism found that patients who took phentermine for up to 24 months experienced sustained weight loss and improvements in metabolic health markers.

Importance of Medical Supervision

While phentermine can be an effective tool for weight loss, it is crucial that its use is supervised by a healthcare professional. Here’s why:

1. Proper Dosage and Administration

  • Medical professionals can determine the appropriate dosage based on the patient's health profile, weight loss goals, and response to the medication.

  • They can adjust the dosage if necessary to maximize effectiveness while minimizing side effects.

2. Monitoring Side Effects

  • Common side effects of phentermine include dry mouth, insomnia, increased heart rate, and anxiety. More severe side effects can include chest pain, difficulty breathing, and swelling in the lower legs.

  • Regular monitoring allows for early detection and management of any adverse reactions.

3. Combining with Lifestyle Changes

  • Weight loss medications like phentermine are most effective when combined with lifestyle changes, including a balanced diet and regular exercise.

  • Healthcare providers can offer guidance and support to help patients make sustainable changes for long-term weight management.

4. Addressing Contraindications

  • Phentermine is not suitable for everyone. Patients with certain medical conditions, such as heart disease, hyperthyroidism, glaucoma, or a history of drug abuse, should not take phentermine.

  • A thorough medical evaluation can help identify any contraindications and ensure patient safety.

Patient Success Stories

To illustrate the effectiveness of phentermine and the importance of medical supervision, here are a couple of success stories from patients who have benefited from the medication:

Success Story 1: Sarah’s Journey

Sarah, a 35-year-old mother of two, struggled with obesity for most of her adult life. With a BMI of 32, she experienced low energy levels and was at risk of developing diabetes. After consulting with her doctor, Sarah was prescribed 15 mg of phentermine daily. With the medication helping to control her appetite, Sarah was able to stick to a healthier diet and started a regular exercise routine. Over six months, she lost 25 pounds and significantly improved her overall health.

Success Story 2: John’s Transformation

John, a 45-year-old office worker, had a BMI of 36 and was dealing with high blood pressure and cholesterol levels. His doctor prescribed 37.5 mg of phentermine to help kickstart his weight loss journey. Under medical supervision, John adhered to a low-calorie diet and increased his physical activity. In nine months, John lost 40 pounds, his blood pressure normalized, and he lowered his cholesterol levels, reducing his risk of cardiovascular disease.


Phentermine is a powerful tool for weight loss that can help individuals achieve significant results when used under proper medical supervision. The available dosages of phentermine, ranging from 8 mg to 37.5 mg, offer flexibility to cater to different patient needs and responses. It is essential for patients to work closely with their healthcare providers to determine the most appropriate dosage and ensure safe and effective use of the medication.

As a weight loss clinic, providing detailed information about phentermine and its dosages can empower your patients to make informed decisions about their weight loss journey. By emphasizing the importance of medical supervision and combining phentermine with lifestyle changes, you can help your patients achieve their weight loss goals and improve their overall health.

If you or someone you know is struggling with obesity and considering weight loss options, consult with a healthcare professional to explore whether phentermine is a suitable choice. With the right support and guidance, achieving a healthier weight and lifestyle is possible.