Sumatriptan Succinate (Page 2 of 7)

5.6 Medication Overuse Headache

Overuse of acute migraine drugs (e.g., ergotamine, triptans, opioids, or combination of these drugs for 10 or more days per month) may lead to exacerbation of headache (medication overuse headache). Medication overuse headache may present as migraine-like daily headaches or as a marked increase in frequency of migraine attacks. Detoxification of patients, including withdrawal of the overused drugs, and treatment of withdrawal symptoms (which often includes a transient worsening of headache) may be necessary.

5.7 Serotonin Syndrome

Serotonin syndrome may occur with sumatriptan succinate tablets, particularly during coadministration with selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), and MAO inhibitors [see Drug Interactions (7.4)]. Serotonin syndrome symptoms may include mental status changes (e.g., agitation, hallucinations, coma), autonomic instability (e.g., tachycardia, labile blood pressure, hyperthermia), neuromuscular aberrations (e.g., hyperreflexia, incoordination), and/or gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea). The onset of symptoms usually occurs within minutes to hours of receiving a new or a greater dose of a serotonergic medication. Discontinue sumatriptan succinate tablets if serotonin syndrome is suspected.

5.8 Increase in Blood Pressure

Significant elevation in blood pressure, including hypertensive crisis with acute impairment of organ systems, has been reported on rare occasions in patients treated with 5-HT1 agonists, including patients without a history of hypertension. Monitor blood pressure in patients treated with sumatriptan succinate. Sumatriptan succinate tablets are contraindicated in patients with uncontrolled hypertension.

5.9 Anaphylactic/Anaphylactoid Reactions

Anaphylactic/anaphylactoid reactions have occurred in patients receiving sumatriptan succinate. Such reactions can be life-threatening or fatal. In general, anaphylactic reactions to drugs are more likely to occur in individuals with a history of sensitivity to multiple allergens. Sumatriptan succinate tablets are contraindicated in patients with a history of hypersensitivity reaction to sumatriptan succinate.

5.10 Seizures

Seizures have been reported following administration of sumatriptan succinate. Some have occurred in patients with either a history of seizures or concurrent conditions predisposing to seizures. There are also reports in patients where no such predisposing factors are apparent. Sumatriptan succinate tablets should be used with caution in patients with a history of epilepsy or conditions associated with a lowered seizure threshold.

6 ADVERSE REACTIONS

The following adverse reactions are discussed in more detail in other sections of the prescribing information:

Myocardial ischemia, myocardial infarction, and Prinzmetal’s angina [see Warnings and Precautions (5.1)]
Arrhythmias [see Warnings and Precautions (5.2)]
Chest, throat, neck, and/or jaw pain/tightness/pressure [see Warnings and Precautions (5.3)]
Cerebrovascular events [see Warnings and Precautions (5.4)]
Other vasospasm reactions [see Warnings and Precautions (5.5)]
Medication overuse headache [see Warnings and Precautions (5.6)]
Serotonin syndrome [see Warnings and Precautions (5.7)]
Increase in blood pressure [see Warnings and Precautions (5.8)]
Hypersensitivity reactions [see Contraindications (4), Warnings and Precautions (5.9)]
Seizures [see Warnings and Precautions (5.10)]

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.
Table 1 lists adverse reactions that occurred in placebo-controlled clinical trials in patients who took at least 1 dose of study drug. Only treatment-emergent adverse reactions that occurred at a frequency of 2% or more in any group treated with sumatriptan succinate tablets and that occurred at a frequency greater than the placebo group are included in Table 1.
Table 1. Adverse Reactions Reported by at Least 2% of Patients Treated with Sumatriptan Succinate Tablets and at a Greater Frequency than Placebo

Adverse Reaction

Percent of Patients Reporting

Sumatriptan Succinate Tablets 25 mg (n = 417)

Sumatriptan Succinate Tablets 50 mg (n = 771)

Sumatriptan Succinate Tablets 100 mg (n = 437)

Placebo (n = 309)

Atypical sensations

5

6

6

4

Paresthesia (all types)

3

5

3

2

Sensation warm/cold

3

2

3

2

Pain and other pressure sensations

6

6

8

4

Chest — pain/tightness/ pressure and/or heaviness

1

2

2

1

Neck/throat/jaw — pain/ tightness/pressure

<1

2

3

<1

Pain — location specified

2

1

1

1

Other — pressure/tightness/ heaviness

1

1

3

2

Neurological Vertigo

<1

<1

2

<1

Other Malaise/fatigue

2

2

3

<1

The incidence of adverse reactions in controlled clinical trials was not affected by gender or age of the patients. There were insufficient data to assess the impact of race on the incidence of adverse reactions.

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