AMPYRA® (dalfampridine) is not a Disease Modifying Therapy (DMT)
AMPYRA is a symptomatic therapy that may be used with DMTs.
Demyelination can result in conduction failure and multiple sites of axonal degeneration.11-13
- Walking is a complex motor activity.9
- The underlying cause of walking difficulty in patients with MS is thought to be areas of demyelination in the CNS and spinal cord.11-14
- Loss of potassium from the axon alters electrical conduction and slows or stops nerve impulses.15-17
- As MS progresses, more areas of demyelination occur, which may lead to loss of conduction.11-13
Selected Important Safety Information
- AMPYRA can cause seizures. The risk of seizures increases with increasing doses. Permanently discontinue AMPYRA if seizure occurs. In the post-marketing period seizures have been reported. The majority of seizures occurred at the recommended dose, in patients without a history of seizures, and generally within days to weeks of starting therapy.
- AMPYRA has not been evaluated in patients with history of seizures or with epileptiform activity on an EEG, as these patients were excluded from clinical trials. The risk of seizures in patients with epileptiform activity on an EEG is unknown, and could be substantially higher than that observed in clinical studies.
- Concomitant use with OCT2 inhibitors (e.g., cimetidine) may cause increased exposure to AMPYRA and potential risk of seizures.
Please see additional Important Safety Information below.
Watch a video about the AMPYRA® (dalfampridine) Mechanism of Action
The mechanism by which AMPYRA exerts its therapeutic effect has not been fully elucidated.
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Important Safety Information
Important Safety Information
- Avoid concomitant use of AMPYRA with other forms of 4-aminopyridine (4-AP, fampridine), since the active ingredient is the same. Instruct patients to discontinue use of any product containing 4-AP prior to initiating AMPYRA to reduce the potential for dose-related adverse reactions.
- AMPYRA can cause anaphylaxis and severe allergic reaction. Signs and symptoms included respiratory compromise, urticaria, and angioedema of the throat or tongue. If an anaphylactic or other serious allergic reaction occurs, permanently discontinue AMPYRA.
- AMPYRA is cleared predominantly by the kidneys. The risk of seizures in patients with mild renal impairment (CrCl 51–80 mL/min) is unknown, but AMPYRA plasma levels in these patients may approach those seen at a dose of 15 mg twice daily, a dose that may be associated with an increased risk of seizures. Estimated CrCl should be known before initiating AMPYRA and monitored at least annually during treatment.
- The most common adverse reactions (incidence ≥ 2% and at a rate greater than placebo) for AMPYRA in MS patients were urinary tract infection, insomnia, dizziness, headache, nausea, asthenia, back pain, balance disorder, multiple sclerosis relapse, paresthesia, nasopharyngitis, constipation, dyspepsia, and pharyngolaryngeal pain.
- The risk of adverse reactions, including seizures, increases with increasing AMPYRA doses. There is no evidence of additional benefit at doses greater than 10 mg twice daily.
- There are no adequate and well-controlled studies of AMPYRA in pregnant women. AMPYRA should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
- It is not known if AMPYRA passes into breast milk. Discontinue AMPYRA or nursing, taking into consideration the importance of AMPYRA to the mother.
- Safety and effectiveness of AMPYRA in patients younger than 18 years have not been established.
- Clinical studies of AMPYRA did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Because elderly patients are more likely to have decreased renal function, it is important to know the estimated CrCl before initiating AMPYRA.
Please see the Full Prescribing Information.