Modafinil

Modafinil treats narcolepsy and is also widely used for a range of other conditions involving excessive sleepiness and fatigue. It is marketed under brand names including Alertec, Vigicer, and Modalert. Use the links below to start your consultation and, if appropriate, buy Modafinil online.

UK ORDERS: Due to post-Brexit issues, affiliated pharmacies can no longer dispense to UK addresses. If you are visiting from the Republic of Ireland or another EU country, please use the consultation links above.

What is Modafinil and what is it used for?

Modafinil is a wakefulness-promoting medication that was originally developed to treat narcolepsy — a neurological condition that causes people to fall asleep suddenly and without warning, often at completely inconvenient or even dangerous moments. It is approved for this use in Ireland and across many EU countries.  

Beyond narcolepsy, doctors can sometimes prescribe Modafinil for a broader range of conditions where excessive sleepiness, fatigue, or impaired cognitive function are a problem. But in Europe, it is usually only prescribed for narcolepsy. 

Researchers are currently looking into its potential to treat:

• Shift work sleep disorder
• Multiple sclerosis-related fatigue
• Attention deficit disorder (ADD)
• Age-related memory decline
• Post-anaesthesia grogginess
• Jet lag and disrupted sleep cycles
• Cognitive impairment associated with conditions like Alzheimer’s disease
• Myotonic dystrophy

Why do people choose Modafinil over other stimulants?

That is actually a very reasonable question. There are older stimulant medications available — amphetamine-based drugs, for example — but Modafinil has a significantly different profile that many patients and doctors find more attractive. Unlike amphetamines, Modafinil does not tend to cause the uncomfortable peaks and crashes that stimulant medications are notorious for. People using it generally report that it improves alertness and concentration without triggering the jitteriness, anxiety, or rebound fatigue that other stimulants can cause.

Modafinil has also shown a low potential for addiction compared to traditional stimulants, which makes it a more manageable long-term option for people who genuinely need help staying awake and alert. It can also have a positive effect on mood and memory — which is part of the reason it has attracted interest beyond its core approved use for narcolepsy.

Dosage — how much should I take?

Always take Modafinil exactly as prescribed by your doctor. The following is general guidance only and your doctor’s instructions take priority over everything else.

Adults: The typical daily dose is between 200mg and 400mg. This can either be taken as a single dose in the morning, or split into two doses — one in the morning and one around noon. Avoid taking Modafinil in the evening, as it may interfere with your ability to sleep.

Elderly patients: Modafinil is cleared from the body more slowly as we age, so older patients — generally those over 65 — are usually started on a lower dose of 100mg per day. This can be gradually increased up to 400mg depending on how well the medication is tolerated and whether there are any kidney or liver concerns.

Patients with liver or kidney problems: If you have impaired liver or kidney function, your dose should be reduced — typically to between 100mg and 200mg per day. Your doctor will advise you accordingly.

As a general rule, one 100mg tablet provides roughly 8 hours of wakefulness-promoting effect, which is useful to bear in mind when planning your doses around your daily schedule.

Is Modafinil right for me? Things to consider before your consultation

Before starting Modafinil, there are a number of things the doctor will want to know about. This is not just box-ticking — it genuinely matters, because Modafinil is not suitable for everyone. Please make sure you complete the consultation questionnaire honestly and in full. Relevant factors include:

• Any existing heart conditions — patients with left ventricular hypertrophy, chest pain, arrhythmia, or mitral valve prolapse should not take Modafinil
• Whether you have or have had anxiety disorders — Modafinil can make anxiety worse and should only be used under specialist supervision in such cases
• High blood pressure — if you have hypertension, your blood pressure and heart rate will need to be monitored regularly while taking this medication
• Whether you are pregnant, trying to become pregnant, or breastfeeding — Modafinil should not be used during pregnancy or lactation
• All other medications you are currently taking — some interact with Modafinil in ways that matter

Modafinil is not recommended for children, as there is insufficient data from controlled studies to establish its safety in younger patients.

Drug interactions — what else are you taking?

This is an important section, so please read it carefully and make sure you mention all current medications to the doctor during your consultation.

Oral contraceptives: This one is particularly important for women. Modafinil reduces the effectiveness of hormonal contraceptives. You should not take Modafinil at the same time as contraceptive products containing 50mg or more of ethinyl estradiol. Even after you stop taking Modafinil, you should wait for two full menstrual cycles before relying on oral contraceptives again. Use alternative contraception in the meantime.

Tricyclic antidepressants: Studies have not shown major interactions between Modafinil and medications like clomipramine, but this combination should still be monitored carefully by your doctor.

Anti-convulsant medications: Formal interaction studies between Modafinil and anti-convulsant drugs have not been conducted, so caution is advised if you are taking both. Tell your doctor.

As with any prescription medication, always tell the doctor about everything you are taking — including supplements, herbal remedies, and anything bought over the counter.

What are the side effects of Modafinil?

Most people tolerate Modafinil reasonably well, but side effects are possible. These can include:

• Headaches
• Nervousness or irritability
• Difficulty sleeping (especially if taken too late in the day)
• Loss of appetite
• Nausea or gastrointestinal discomfort
• Dry mouth
• Increased heart rate (tachycardia)
• Heart rhythm irregularities (arrhythmia)

In rare cases, skin rashes or involuntary movements (dyskinesia) have been reported. If you notice a skin rash developing after starting Modafinil, contact your doctor promptly — in rare instances, Modafinil has been associated with serious skin reactions.

If you experience any side effect that is not listed above, or anything that concerns you, stop taking the medication and speak to a doctor.

What if I miss a dose?

If you forget to take your dose, the most likely result is that you will simply feel sleepy — which is what Modafinil was there to prevent. Take the missed dose when you wake up, but do not take a double dose to make up for the one you missed. And as always, avoid taking it late in the day if you want to be able to sleep that night.

What about overdose?

The most prominent symptom of a Modafinil overdose is severe insomnia, though agitation and elevated heart rate can also occur. If an overdose is suspected, seek medical attention. Depending on the circumstances, treatment may involve induced vomiting or gastric lavage, and hospitalisation may be required to monitor heart function and psychomotor activity.

A note for athletes

If you compete in any sport governed by anti-doping regulations, you should be aware that Modafinil may produce a positive result in doping tests. This has been the case in high-profile sporting contexts. Check with your relevant sporting body before taking Modafinil.

Driving and operating machinery

Although Modafinil is a wakefulness-promoting agent, its effects on the ability to drive or operate heavy machinery have not been fully established. Narcolepsy itself can impair driving ability, and you should discuss this with your doctor. Do not assume that taking Modafinil automatically makes it safe for you to drive — your doctor’s guidance on this is important.

Dependence and long-term use

Studies suggest that Modafinil carries a low risk of dependence compared to other stimulant medications, which is one of its advantages. That said, long-term use is not without risk, and it should always be taken under medical supervision. Do not take more than prescribed, and do not continue taking it for longer than your doctor recommends without a follow-up consultation.