What is Phentermine?

Category: Prescription Drugs

Most popular types: Adipex-P Duromine Ionamin

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Phentermine is an appetite suppressant to help reduce weight when used short-term and combined with exercise, diet, and behavioral modification. It is typically prescribed for individuals who are at increased medical risk because of their weight and works by reducing appetite.

Reported purpose & perceived effectiveness
Purpose Patients Evaluations Perceived Effectiveness
Weight loss 78 45
Fatigue 37 18
Support weight loss 25 15
Exhaustion 3 1
Obesity 3 2
Excessive daytime sleepiness (somnolence) 2 1

Show all 20 reasons taken


  • Major
  • Moderate
  • Slight
  • None
  • Can't tell

Side effects

Side effects as an overall problem

Side effects as an overall problem
Severity Evaluations
Severe 9
Moderate 9
Mild 18
None 41

Commonly reported side effects and conditions associated with Phentermine

Side effect Patients
Dry mouth 4
Insomnia 4
Jittery feeling 4
Anxious mood 3
Constipation 3
Increased insomnia 3

Show all 32 reported side effects

Dosages

Based on patients currently taking Phentermine

Dosage Patients
37.5 mg daily 12
18.75 mg daily 4
30 mg daily 2
15 mg daily 1
37.5 mg twice daily 1
75 mg daily 1

Why patients stopped taking Phentermine

Multiple reasons could be selected

Reason Patients
Did not seem to work 14
Doctor's advice 14
Other 14
Expense 10
Side effects too severe 9
Course of treatment ended 7
Change in health plan coverage 1
See all 55 patients who've stopped taking Phentermine

Duration

Currently taking Phentermine

Duration Patients
1 - 6 months 6
6 months - 1 year 2
1 - 2 years 4
2 - 5 years 6
5 - 10 years 2
10 years or more 1

Stopped taking Phentermine

Duration Patients
Less than 1 month 7
1 - 6 months 27
6 months - 1 year 8
1 - 2 years 9
2 - 5 years 2
5 - 10 years 1
10 years or more 1
Adherence
Adherence Evaluations
Always 62
Usually 5
Sometimes 4
Never taken as prescribed 6
Burden
Burden Evaluations
Very hard to take 1
Somewhat hard to take 1
A little hard to take 7
Not at all hard to take 68
Cost per month
Cost per month Evaluations
$200+ 2
$100-199 6
$50-99 6
$25-49 19
< $25 27
Not specified 17

What people switch to and from

Patients started taking Phentermine after stopping:

Treatment Patients
Aripiprazole (Abilify) 1
Levothyroxine (Synthroid) 1

Patients stopped taking Phentermine and switched to:

Treatment Patients
Amphetamine-Dextroamphetamine (Adderall) 1
Benzphetamine 1
Orlistat (Alli) 1
Last updated:

8 patient evaluations for Phentermine

Aug 11, 2009 (Started Jan 01, 1993)

  • Effectiveness
    Moderate (for fibromyalgia)
  • Side effects
    Mild (need for nap, overactivity, constipation, insomnia)
  • Adherence
    Always
  • Burden
    Not at all hard to take
Dosage: 18.75 mg Daily
Advice & Tips: I have been taking this medication for my chronic fatigue (due to my fibro) for over 13 years. I am actually surprized that more people do not take it. Without it I cannot wake up, will sleep up to 20 hours a day, have a hard time driving or shopping without getting drowsy, and gain weight excessivly without eating. With it i do have a hard time getting a full 8 hours of sleep sometimes, but i get 6 or 7 a night, and am able to walk for excercise daily. Without it I cannot walk more than a few minutes without getting out of breath.
Cost: $100-199 monthly
Side effects: need for nap, overactivity, insomnia, constipation

  • 1 helpful mark

Jan 11, 2009 (Started May 11, 2007)

  • Effectiveness
    Major (for weight loss)
  • Side effects
    Mild (overactivity, jittery feeling, constipation, insomnia)
  • Adherence
    Always
  • Burden
    Not at all hard to take
Dosage: 75 mg Daily
Cost: < $25 monthly
Side effects: jittery feeling, overactivity, insomnia, constipation

  • 0 helpful marks
Last updated:
Showing 2 of 8 patient evaluations for Phentermine