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 81 47
Fatigue 37 18
Support weight loss 26 16
Exhaustion 3 1
Obesity 3 2

Show all 19 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 19
None 42

Commonly reported side effects and conditions associated with Phentermine

Side effect Patients
Dry mouth 5
Insomnia 4
Jittery feeling 4
Anxious mood 3
Constipation 3
Tachycardia (fast heart rate) 3

Show all 30 reported side effects

Dosages

Based on patients currently taking Phentermine

Dosage Patients
37.5 mg daily 15
18.75 mg daily 3
30 mg daily 3

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
Course of treatment ended 9
Side effects too severe 9
Change in health plan coverage 1
See all 56 patients who've stopped taking Phentermine

Duration

Currently taking Phentermine

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

Stopped taking Phentermine

Duration Patients
Less than 1 month 7
1 - 6 months 29
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 7
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 70
Cost per month
Cost per month Evaluations
$200+ 2
$100-199 6
$50-99 6
$25-49 19
< $25 29
Not specified 17

What people switch to and from

Patients started taking Phentermine after stopping:

Treatment Patients
Aripiprazole (Abilify) 1
Levothyroxine (Synthroid) 1
Phentermine (Adipex-P) 1

Patients stopped taking Phentermine and switched to:

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

8 patient evaluations for Phentermine

Nov 24, 2015 (Started May 02, 2015)

  • Effectiveness
    Major (for weight loss)
  • Side effects
    Severe (heart palpitations, tachycardia (fast heart rate))
  • Adherence
    Always
  • Burden
    Not at all hard to take
Cost: < $25 monthly

  • 0 helpful marks

Oct 7, 2014 (Started Mar 15, 2011)

  • Effectiveness
    Slight (for lack of energy)
  • Effectiveness
    Slight (for Support weight loss)
  • Effectiveness
    Slight (for fatigue)
  • Effectiveness
    Slight (for daytime sleepiness)
  • Side effects
    None
  • Adherence
    Always
  • Burden
    Not at all hard to take
Dosage: 37.5 mg Daily

  • 0 helpful marks

Feb 1, 2012 (Started Dec 23, 2011)

  • Effectiveness
    Major (for fatigue)
  • Side effects
    Mild (weight loss)
  • Adherence
    Always
  • Burden
    Not at all hard to take
Dosage: 20 mg Daily
Advice & Tips: A lower dose avoids come down in moods and keeps you perky.
Cost: $100-199 monthly

Jan 23, 2012 (Started Dec 23, 2011)

  • Effectiveness
    Major (for fatigue)
  • Side effects
    None
  • Adherence
    Always
  • Burden
    Not at all hard to take
Dosage: 20 mg Daily
Advice & Tips: I take it only on days I work so the weekend and Wednesdays I have a rest which I think is important. Also if you're taking it for energy production then be careful to make sure to eat as you'll loose weight on this medicine. Take it early when you get up and by bed time you should sleep.
Cost: $100-199 monthly

  • 0 helpful marks
Last updated:
Showing 3 of 8 patient evaluations for Phentermine