ZLPIDEM SIDE EFFECTS
The following serious adverse reactions are discussed in greater detail in other sections of the labeling:
- CNS-depressant effects and next-day impairment [see WARNINGS ANDPRECAUTIONS]
- Serious anaphylactic and anaphylactoid reactions [see WARNINGS AND PRECAUTIONS]
- Abnormal thinking and behavior changes, and complex behaviors [seeWARNINGS AND PRECAUTIONS]
- Withdrawal effects [see WARNINGS AND PRECAUTIONS]
Clinical Trials Experience
Associated with discontinuation of treatment
Approximately 4% of 1,701 patients who received zolpidem at all doses (1.25 to 90 mg) in U.S. premarketing clinical trials discontinued treatment because of an adverse reaction. Reactions most commonly associated with discontinuation from U.S. trials were daytime drowsiness (0.5%), dizziness(0.4%), headache (0.5%), nausea (0.6%), and vomiting (0.5%).
Approximately 4% of 1,959 patients who received zolpidem at all doses (1 to 50 mg) in similar foreign trials discontinued treatment because of an adverse reaction. Reactions most commonly associated with discontinuation from these trials were daytime drowsiness (1.1%), dizziness/vertigo (0.8%),amnesia (0.5%), nausea (0.5%), headache (0.4%), and falls (0.4%).
Data from a clinical study in which selective serotonin reuptake inhibitor (SSRI)-treated patients were given zolpidem revealed that four of the seven discontinuations during double-blind treatment with zolpidem (n=95) were associated with impaired concentration, continuing or aggravated depression, and manic reaction; one patient treated with placebo (n =97) was discontinued after an attempted suicide.
Most commonly observed adverse reactions in controlled trials
During short-term treatment (up to 10 nights) with Ambien at doses up to 10 mg, the most commonly observed adverse reactions associated with the use of zolpidem and seen at statistically significant differences from placebo-treated patients were drowsiness (reported by 2% of zolpidem patients), dizziness (1%), and diarrhea (1%). During longer-term treatment (28 to 35 nights) with zolpidem at doses up to 10 mg, the most commonly observed adverse reactions associated with the use of zolpidem and seen at statistically significant differences from placebo-treated patients were dizziness (5%) and drugged feelings (3%).
Adverse reactions observed at an incidence of ≥ 1% in controlled trials
The following tables enumerate treatment-emergent adverse reactions frequencies that were observed at an incidence equal to 1% or greater among patients with insomnia who received zolpidem tartrate and at a greater incidence than placebo in U.S. placebo-controlled trials. Events reported by investigators were classified utilizing a modified World Health Organization (WHO) dictionary of preferred terms for the purpose of establishing event frequencies. The prescriber should be aware that these figures cannot be used to predict the incidence of side effects in the course of usual medical practice, in which patient characteristics and other factors differ from those that prevailed in these clinical trials. Similarly, the cited frequencies cannot be compared with figures obtained from other clinical investigators involving related drug products and uses, since each group of drug trials is conducted under a different set of conditions. However, the cited figures provide the physician with a basis for estimating the relative contribution of drug and nondrug factors to the incidence of side effects in the population studied.
The following table was derived from results of 11 placebo-controlled short-term U.S. efficacy trials involving zolpidem in doses ranging from 1.25 to 20 mg. The table is limited to data from doses up to and including 10 mg, the highest dose recommended for use.
Incidence of Treatment-Emergent Adverse Experiences in Placebo-Controlled Clinical Trials Lasting up to 10 Nights (Percentage of patients reporting)
| BODY SYSTEM/ ADVERSE EVENT* | ZOLPIDEM ( ≤ 10 MG) (N=685) | PLACEBO (N=473) |
| Central and Peripheral Nervous System | ||
| Headache | 7 | 6 |
| Drowsiness | 2 | - |
| Dizziness | 1 | - |
| Gastrointestinal System | ||
| Diarrhea | 1 | - |
| *Reactions reported by at least 1% of patients treated with Ambien and at a greater frequency than placebo. | ||
The following table was derived from results of three placebo-controlled long-term efficacy trials involving Ambien (zolpidem tartrate). These trials involved patients with chronic insomnia who were treated for 28 to 35 nights with zolpidem at doses of 5, 10, or 15 mg. The table is limited to data from doses up to and including 10 mg, the highest dose recommended for use. The table includes only adverse events occurring at an incidence of at least 1% for zolpidem patients.
Incidence of Treatment-Emergent Adverse Experiences in Placebo-Controlled Clinical Trials Lasting up to 35 Nights (Percentage of patients reporting)
| BODY SYSTEM/ ADVERSE EVENT* | ZOLPIDEM ( ≤ 10 MG) (N=152) | PLACEBO (N=161) |
| Autonomic Nervous System | ||
| Dry mouth | 3 | 1 |
| Body as a Whole | ||
| Allergy | 4 | 1 |
| Back Pain | 3 | 2 |
| Influenza-like symptoms | 2 | - |
| Chest pain | 1 | - |
| Cardiovascular System | ||
| Palpitation | 2 | - |
| Central and Peripheral Nervous System | ||
| Drowsiness | 8 | 5 |
| Dizziness | 5 | 1 |
| Lethargy | 3 | 1 |
| Drugged feeling | 3 | - |
| Lightheadedness | 2 | 1 |
| Depression | 2 | 1 |
| Abnormal dreams | 1 | - |
| Amnesia | 1 | - |
| Sleep disorder | 1 | - |
| Gastrointestinal System | ||
| Diarrhea | 3 | 2 |
| Abdominal pain | 2 | 2 |
| Constipation | 2 | 1 |
| Respiratory System | ||
| Sinusitis | 4 | 2 |
| Pharyngitis | 3 | 1 |
| Skin and Appendages | ||
| Rash | 2 | 1 |
| *Reactions reported by at least 1% of patients treated with Ambien and at a greater frequency than placebo. | ||
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