Controlled substance Published: RCT evidence Extensive real-world use

Modafinil: dosing, timing and what to expect

The wakefulness drug — prescribed for narcolepsy and shift work, used off-label for focus at scale. A community staple that sits closer to this library's audience than almost any other prescription.

Also known as Provigil, armodafinil, Nuvigil, Alertec

Educational research reference Prescription Medications

Quick reference. Everything you need to run Modafinil — dosing, frequency, reconstitution math for the vial sizes people actually buy, and what it stacks with. For anything specific to your situation, ask the Guru.

Modafinil quick start

Route: Oral
Typical dose: Physician-set — commonly 100–200 mg/day
Frequency: Daily, morning
Half-life: ~13 hours — afternoon doses cost you sleep.
Cycle: As prescribed — Schedule IV in the US.

These are the numbers people actually run, drawn from the published record and from what the community has settled on over time. Educational reference, not medical advice — a starting point to work from, and one you can adjust as you learn how you respond.

How to run it

How often: Daily, morning
Cycle length: As prescribed — Schedule IV in the US.
Half-life: ~13 hours — afternoon doses cost you sleep.
Route: Oral

Consistency matters more than perfect timing. Pick a slot in your day you will actually keep, and let DoseIQ handle the rest.

For women

The label warning matters: modafinil reduces the effectiveness of oral, patch and implant contraception, during use and for a month after stopping. A non-hormonal backup is the standard advice.

What to expect

Most people tolerate Modafinil well. Here is what is worth knowing going in, so nothing catches you by surprise.

A CYP3A4 inducer — it lowers the levels of several other drugs, and the label specifically warns it reduces the effectiveness of hormonal contraception. Rare but serious skin reactions mean any spreading rash gets medical attention.

Known interactions

Interactions involving Modafinil's drug class that DoseIQ screens for. Each one cites where it comes from — an FDA label section or the published record — because an interaction warning you can't trace is just noise.

Serious Modafinil + hormonal contraception — reduced efficacy

Modafinil induces the enzyme that clears contraceptive hormones — the label warns effectiveness is reduced during use and for a month after stopping.

What to do: The label's advice is a non-hormonal backup method while on it and for one month after.

Source: FDA label, modafinil §7

Caution Stimulant + bupropion — additive blood pressure and seizure threshold

Both raise blood pressure and heart rate, and bupropion lowers the seizure threshold — additive in both directions.

What to do: A common, usually-fine prescription combo — but it should be a deliberate one both prescribers know about. BP is worth logging.

Source: FDA label, bupropion §7

DoseIQ screens your whole protocol against these rules automatically — every compound, prescription and supplement you track, cross-checked as you add them. Serious flags are always free.

Preparing it

Modafinil does not need reconstituting — it comes ready to use.

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This page is an educational research reference and is not medical advice. Modafinil is a controlled substance requiring a prescription. Dose figures reflect the published record and what the community has converged on — starting points to weigh, not instructions. Consult a qualified healthcare provider before starting any protocol.