What is Diphenhydramine?

Category: Over the Counter Drugs

Most popular types: Benadryl Benadryl Allergy Nightime Sleepaid Show all

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Diphenhydramine is an antihistamine. It is used to relieve irritated, itchy, watery eyes; sneezing; and runny nose caused by hay fever, allergies, or the common cold. It may also be used to prevent and treat motion sickness, or to control abnormal movements in early stage parkinsonian syndrome.

Reported purpose & perceived effectiveness
Purpose Patients Evaluations Perceived Effectiveness
Insomnia 209 97
Food allergy 56 28
Itching 36 14
Anaphylaxis 27 15
Chemical/venom allergy 13 11

Show all 142 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 19
Moderate 60
Mild 80
None 123

Commonly reported side effects and conditions associated with Diphenhydramine

Side effect Patients
Drowsiness 34
Sleepiness 22
Dry mouth 12
Excessive daytime sleepiness (somnolence) 8
Grogginess in morning 8
Brain fog 6

Show all 51 reported side effects

Dosages

Based on patients currently taking Diphenhydramine

Dosage Patients
25mg as needed 32
50 mg daily 21
25 mg daily 18
2 25mg as needed 17
50mg as needed 9
50 mg twice daily 5
25 mg twice daily 4
50 mg every other week 2
12.5 mg daily 2
25 mg three times daily 2

See all 31 dosages

Why patients stopped taking Diphenhydramine

Multiple reasons could be selected

Reason Patients
Other 67
Did not seem to work 48
Course of treatment ended 36
Doctor's advice 31
Side effects too severe 22
Personal research 11
Expense 5
Change in health plan coverage 1
See all 193 patients who've stopped taking Diphenhydramine

Duration

Currently taking Diphenhydramine

Duration Patients
Less than 1 month 1
1 - 6 months 7
6 months - 1 year 6
1 - 2 years 15
2 - 5 years 23
5 - 10 years 37
10 years or more 47

Stopped taking Diphenhydramine

Duration Patients
Less than 1 month 66
1 - 6 months 38
6 months - 1 year 25
1 - 2 years 19
2 - 5 years 22
5 - 10 years 8
10 years or more 19
Adherence
Adherence Evaluations
Always 165
Usually 69
Sometimes 37
Never taken as prescribed 11
Burden
Burden Evaluations
Very hard to take 4
Somewhat hard to take 17
A little hard to take 36
Not at all hard to take 225
Cost per month
Cost per month Evaluations
$200+ 1
$100-199 0
$50-99 1
$25-49 7
< $25 147
Not specified 126

What people switch to and from

Patients stopped taking Diphenhydramine and switched to:

Treatment Patients
Hydroxyzine (Vistaril) 4
Diphenhydramine (IV or IM) (Benadryl IV) 1
Trazodone (Desyrel) 1
Last updated:

24 patient evaluations for Diphenhydramine

Feb 22, 2010 (Started )

  • Effectiveness
    Moderate (for sleep problems)
  • Side effects
    Mild
  • Adherence
    Always
  • Burden
    Not at all hard to take

  • 0 helpful marks

Feb 10, 2010 (Started May 01, 2000)

  • Effectiveness
    Moderate (for insomnia)
  • Side effects
    Moderate (hangover effect)
  • Adherence
    Sometimes
  • Burden
    Not at all hard to take
Cost: < $25 monthly
Side effects: hangover effect

Jan 1, 2010 (Started May 01, 2000)

  • Effectiveness
    Slight (for insomnia)
  • Side effects
    Mild (hangover effect)
  • Adherence
    Sometimes
  • Burden
    Not at all hard to take
Dosage: As needed
Cost: < $25 monthly
Side effects: hangover effect

  • 0 helpful marks

Feb 5, 2010 (Started Dec 04, 2009)

  • Effectiveness
    Slight (for insomnia)
  • Effectiveness
    Slight (for itching)
  • Side effects
    Mild (drowsy in morning)
  • Adherence
    Always
  • Burden
    A little hard to take
Dosage: As needed
Cost: < $25 monthly
Side effects: drowsy in morning

  • 0 helpful marks
Last updated:
Showing 3 of 24 patient evaluations for Diphenhydramine