Modafinil Morningside Healthcare (Modafinil)

Modafinil is used to address disorders of excessive daytime sleepiness within the central nervous system stimulant class.

• Narcolepsy: reduces the frequency of sudden sleep attacks and improves daytime vigilance.
• Obstructive sleep apnea‑related excessive daytime sleepiness: enhances wakefulness when used as an adjunct to primary therapy.
• Shift work sleep disorder: mitigates sleepiness during scheduled work hours that fall outside the normal circadian rhythm.

• Modafinil promotes wakefulness primarily by inhibiting the reuptake of dopamine, thereby increasing extracellular dopamine concentrations in the brain. It also stimulates hypothalamic orexin neurons and enhances adrenergic signaling, which together raise cortical arousal and reduce sleep propensity. These actions collectively augment dopaminergic and noradrenergic neurotransmission without directly binding to traditional stimulant receptors.

Modafinil may cause a range of adverse reactions, which are generally categorized by frequency and severity.

Common Side Effects

• Headache: mild to moderate intensity.
• Nausea: occasional gastrointestinal upset.
• Insomnia: difficulty initiating or maintaining sleep.
• Anxiety or nervousness: transient feelings of tension.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome or toxic epidermal necrolysis: severe skin reactions requiring immediate medical attention.
• Psychiatric disturbances: emergence of hallucinations, mania, or depression.
• Cardiovascular events: arrhythmia or hypertension in susceptible individuals.
• Liver injury: elevated transaminases indicating hepatic stress.

When prescribing Modafinil, clinicians should consider several safety measures to minimize risk.

• Assess cardiovascular status: evaluate blood pressure and heart rhythm before initiating therapy.
• Review psychiatric history: avoid use in patients with uncontrolled psychosis or severe mood disorders.
• Monitor hepatic function: consider liver enzyme testing in patients with pre‑existing liver disease.
• Caution in pregnancy and lactation: use only if potential benefit justifies potential risk.
• Avoid abrupt discontinuation: taper the dose to reduce rebound sleepiness.
• Store at ambient temperature: keep below 25 °C in the original container, protected from moisture and light.

Modafinil can interact with several medicines, requiring attention to avoid reduced efficacy or increased toxicity.

Major Interactions (Avoid)

• CYP3A4 inducers (e.g., rifampin, carbamazepine): may markedly reduce Modafinil plasma concentrations.
• Hormonal contraceptives: Modafinil can decrease efficacy, increasing risk of unintended pregnancy.
• Monoamine oxidase inhibitors (MAOIs): concurrent use may heighten sympathomimetic effects.

Moderate Interactions (Monitor Closely)

• CYP2C19 inhibitors (e.g., fluvoxamine): may increase Modafinil exposure and side‑effect risk.
• Antidepressants (SSRIs, SNRIs): may augment central nervous system stimulation.
• Antihypertensive agents: Modafinil may attenuate blood‑pressure‑lowering effects.