Modafinilo Aristo (Modafinil)

Modafinil is a wakefulness‑promoting eugeroic indicated for several sleep‑related disorders that cause excessive daytime sleepiness.

• Narcolepsy: significantly reduces episodes of uncontrollable sleep attacks and excessive daytime sleepiness, thereby improving daily functioning and alertness.
• Excessive daytime sleepiness associated with obstructive sleep apnea: mitigates residual sleepiness that persists despite optimal CPAP or other primary OSA treatments, supporting better wakefulness.
• Shift work sleep disorder: assists individuals who work non‑traditional hours to stay awake and perform tasks safely during their scheduled work periods.

• Modafinil promotes wakefulness primarily by inhibiting the reuptake of dopamine, leading to increased extracellular dopamine concentrations in brain regions that regulate arousal. It also stimulates orexin (hypocretin) neurons and modestly influences histamine, norepinephrine and serotonin pathways, collectively enhancing cortical activation and reducing sleep propensity. Additionally, Modafinil may affect glutamatergic transmission and reduce GABAergic inhibition, contributing to its overall alerting effect.

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

Common Side Effects

• Headache: mild to moderate headache often described as throbbing.
• Nausea: feeling of stomach upset or queasiness, sometimes with vomiting.
• Insomnia: difficulty falling asleep or staying asleep, leading to daytime fatigue.
• Anxiety: increased nervousness, tension, or feeling of restlessness.
• Dry mouth: reduced salivation causing throat discomfort or difficulty swallowing.
• Dizziness: sensation of lightheadedness or unsteadiness, especially when standing quickly.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction with blistering, mucosal involvement and fever.
• Cardiovascular events: chest pain, palpitations, hypertension or arrhythmias.
• Psychiatric disturbances: hallucinations, mania, severe depression or suicidal thoughts.
• Liver injury: marked elevation of liver enzymes, hepatitis or jaundice.

When prescribing Modafinil, clinicians should consider several precautionary measures to ensure safe use.

• Cardiovascular assessment: evaluate blood pressure and heart disease history before initiation.
• Psychiatric history: screen for prior psychosis, mania or severe depression.
• Liver function: monitor hepatic enzymes in patients with liver impairment.
• Drug dependence: avoid use in individuals with a history of substance abuse.
• Pregnancy and lactation: use only if potential benefit justifies potential risk, as safety data are limited.
• Store at ambient temperature: keep below 25 °C in original packaging, protect from moisture and light.

Modafinil can interact with other medicines, altering their effectiveness or increasing adverse effects.

Major Interactions (Avoid)

• CYP3A4 inducers (e.g., carbamazepine, phenytoin, rifampin): may markedly reduce Modafinil plasma levels.
• Hormonal contraceptives: decreased efficacy, increasing risk of unintended pregnancy.
• Antidepressants (e.g., SSRIs, SNRIs): heightened risk of serotonin syndrome when combined with serotonergic agents.

Moderate Interactions (Monitor Closely)

• CYP2C19 inhibitors (e.g., fluoxetine, omeprazole): may increase Modafinil exposure, requiring dose adjustment.
• Anticoagulants (e.g., warfarin): potential alteration of INR, necessitating closer monitoring.
• Antihypertensives: possible reduction in blood pressure control, monitor blood pressure.