DIQTA 1.0: Drug-Induced QT Prolongation Atlas

AMIFAMPRIDINE

DIR Classification Postmarketing Surveillance Drug Property Information Reference

DIR Classification

Classification:Moderate-DIQT concern

Severity Score:2.0

Description in Drug Labeling: View Full Labeling: SPL in DailyMed | PDF

OVERDOSAGE
In case reports, events reported after intake of RUZURGI at doses of 300 mg per day or greater (more than three times the maximum recommended daily dosage) include vomiting, nystagmus, seizures and status epilepticus, rhabdomyolysis, chest pain, diaphoresis, palpitations, paroxysmal supraventricular tachycardia, transient QTc prolongation, aspiration with acute respiratory failure, and cardiac arrest.
Patients with suspected overdose with RUZURGI should be monitored for signs or symptoms of exaggerated RUZURGI adverse reactions or effects, and appropriate symptomatic treatment instituted immediately.
ADVERSE REACTIONS
Clinical Trials Experience
Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice.
In a double-blind, 3-way crossover, pharmacology study to assess the effects of RUZURGI on QTc interval prolongation, RUZURGI was administered at doses greater than the maximum recommended dose (120 mg administered as 4 equal doses of 30 mg at 4-hour intervals) to 52 healthy adult volunteers [see Clinical Pharmacology (12.2)]. Adverse reactions that occurred in at least 5% of subjects during RUZURGI treatment and with incidence at least 2% greater than during placebo treatment are displayed in TABLE 2.
Expanded Access Experience
In general, the most frequent adverse reactions observed in the expanded access programs were similar to those observed in the QT study. Additionally, the following adverse reactions were reported in ≥5% of patients: falls, diarrhea, pneumonia, dyspnea, arthralgia, asthenia, depression, dysphagia, headache, insomnia, vision blurred, anemia, anxiety, constipation, feeling cold, gastroesophageal reflux disease, and pain. Because these reactions were captured retrospectively from expanded access programs, it is not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
CLINICAL PHARMACOLOGY
Pharmacodynamics
Cardiac Electrophysiology
The effect of RUZURGI on QTc interval prolongation was studied in a double-blind, randomized, placebo- and positive-controlled study in 52 healthy volunteers (including 23 subjects with poor metabolizer phenotype). Study participants were administered 120 mg RUZURGI in 4 equal doses of 30 mg at 4-hour intervals (Dose 1, 2, 3, and 4) [see Clinical Pharmacology (12.5)]. RUZURGI did not prolong the QTc interval to any clinically relevant extent. In vitro, RUZURGI did not inhibit the human ether-à-go-go-related gene ion channel.

Postmarketing Surveillance

Contingency Table:

Current Drug

Other Drugs

QT Prolongation

24092

Other ADRs

38381587

Odds Ratio = N/A

Drug Property Information

ATC Code(s):

N07XX05 - amifampridine

N07XX - Other nervous system drugs
N07X - OTHER NERVOUS SYSTEM DRUGS
N07 - OTHER NERVOUS SYSTEM DRUGS
N - NERVOUS SYSTEM

Active Ingredient:Amifampridine

Active Ingredient UNII:RU4S6E2G0J

Drugbank ID:DB11640

PubChem Compound:N/ADIR Classification

CTD ID:D000077770

PharmGKB:

CAS Number:54-96-6

Dosage Form(s):tablet

Route(s) Of Administrator:oral

Daily Dose:

40.0 mg/day N07XX05

Chemical Structure:

SMILE Code:
NC1=CC=NC=C1N

Reference

N/A