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HOME >> API >> API List 2 >> Modafinil

Molecular Structure



Modafinil

Molecular Formula C15H15NO2S

Molecular Weight 273.35

CAS Registry Number 68693-11-8

ATC code N06BA07
PubChem 4236
DrugBank APRD00534

Chemical data

Formula C15H15NO2S
Mol. mass 273.35
SMILES eMolecules & PubChem

Physical data

Melt. point 164–166 °C (327–331 °F)
Solubility in water 0.622 mg/mL (20 °C)
Pharmacokinetic data
Bioavailability Not determined due to the aqueous insolubility
Protein binding 60%
Metabolism Hepatic, including CYP3A4 and other pathways
Half life 10–12 hours
Excretion Urine (as metabolites)

Why is this medication prescribed?
Modafinil is used to treat excessive sleepiness caused by narcolepsy (a condition that causes excessive daytime sleepiness) or shift work sleep disorder (sleepiness during scheduled waking hours and difficulty falling asleep or staying asleep during scheduled sleeping hours in people who work at night or on rotating shifts). Modafinil is also used along with breathing devices or other treatments to prevent excessive sleepiness caused by obstructive sleep apnea/hypopnea syndrome (OSAHS; a sleep disorder in which the patient briefly stops breathing or breathes shallowly many times during sleep and therefore doesn't get enough restful sleep). Modafinil is in a class of medications called wakefulness promoting agents. It works by changing the amounts of certain natural substances in the area of the brain that controls sleep and wakefulness.

How should this medicine be used?
Modafinil comes as a tablet to take by mouth. It is usually taken once a day with or without food. If you are taking modafinil to treat narcolepsy or OSAHS, you will probably take it in the morning. If you are taking modafinil to treat shift work sleep disorder, you will probably take it 1 hour before the beginning of your work shift. Take modafinil at the same time every day. Do not change the time of day that you take modafinil without talking to your doctor. Talk to your doctor if your work shift does not begin at the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take modafinil exactly as directed.

Modafinil may be habit-forming. Do not take a larger dose, take it more often, or take it for a longer period of time than prescribed by your doctor.

Modafinil may decrease your sleepiness, but it will not cure your sleep disorder. Continue to take modafinil even if you feel well-rested. Do not stop taking modafinil without talking to your doctor.

Modafinil should not be used in place of getting enough sleep. Follow your doctor's advice about good sleep habits. Continue to use any breathing devices or other treatments that your doctor has prescribed to treat your condition, especially if you have OSAHS.

What side effects can this medication cause?
Modafinil may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• headache
• dizziness
• difficulty falling asleep or staying asleep
• drowsiness
• nausea
• diarrhea
• constipation
• gas
• heartburn
• loss of appetite
• unusual tastes
• dry mouth
• excessive thirst
• nosebleed
• flushing
• sweating
• tight muscles or difficulty moving
• back pain
• confusion
• uncontrollable shaking of a part of your body
• burning, tingling, or numbness of the skin
• difficulty seeing or eye pain

Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately:

• rash
• blisters
• peeling skin
• mouth sores
• hives
• itching
• hoarseness
• difficulty breathing or swallowing
• swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
• chest pain
• fast, pounding, or irregular heartbeat
• frenzied, abnormally excited mood
• hallucinating (seeing things or hearing voices that do not exist)
• anxiety
• depression
• thinking about killing or harming yourself

Modafinil may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

What storage conditions are needed for this medicine?
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

Store modafinil in a safe place so that no one else can take it accidentally or on purpose. Keep track of how many tablets are left so you will know if any are missing.

Information Associated with Product:
DRUG DESCRIPTION DOSAGE SIDE EFFECTS PRECAUTIONS INTERACTION CONSUMER INFORMATION
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