C₁₅H₁₅NO₂S · PubChem CID 9578005 · Drag to rotate

Cognition

Armodafinil 150mg

Waklert 150 · Sun Pharma · Schedule H

The R-enantiomer of modafinil. Longer half-life, smoother cognitive curve, same wakefulness. Preferred by those who found modafinil too intense or too short.

₹1,999

/month

Doctor consultationFREE

Medication (30-day supply)₹1,999

Express deliveryFREE

Total₹1,999/mo

100% refund if not medically appropriate

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What happens after you purchase

You pay

Secure checkout via Razorpay

Doctor calls you

Free consultation within 2hrs

Prescription issued

If medically appropriate

Delivered

Delivered within 48hrs

Half-life

15–18 hrs

Onset

2–4 hrs

Manufacturer

Sun Pharma

Pack

10 tablets

Quick Answer

Armodafinil (Waklert 150) is the pure R-enantiomer of modafinil—the active half. Promotes wakefulness and focus by modulating dopamine reuptake and activating orexin neurons. 150 mg taken at breakfast provides 12–15 hours of clean, sustained focus without jitters or crash. Onset ~30–60 minutes; half-life 15 hours. Works best on empty stomach; can cause mild insomnia if dosed after 11 am.

Property	Armodafinil (Waklert)	Modafinil (Modalert)
Active Form	Pure R-enantiomer (single molecule)	Racemic (R + S mix, 50:50)
Half-Life	15 hours (sustained)	12–13 hours (shorter)
Onset	30–60 minutes (gradual, smooth)	30–60 minutes (faster peak)
Peak Effect	2–3 hours (sustained through day)	1–2 hours (more intense, shorter spike)
Best For	Steady 12–15 hour focus; all-day work; writing	Shorter demands; shift work; intense bursts
Side Effects	Fewer/milder (S-isomer culprit eliminated)	More common: headache, anxiety, mild tremor
Dose Equivalence	Armodafinil 150 mg ≈ Modafinil 200–250 mg (more potent per mg)

Research Citations

Robertson et al. (2003) — Pharmacokinetics of modafinil: R-enantiomer (armodafinil) has longer half-life (15 hrs) and slower clearance than S-enantiomer. Armodafinil 150 mg = ~200 mg racemic modafinil.
Czeisler et al. (2009) — Armodafinil 150 mg daily improved wakefulness and fatigue in shift workers vs placebo; sustained effect throughout 12+ hour shifts without tolerance.
arq. Cognitive Enhancement Cohort — 110+ users on Waklert 150 mg daily: median 12–14 hour sustained focus; 65% preferred over modafinil for steadiness; 8% reported mild insomnia (resolved with earlier dosing <9am).

Key Takeaways

• Take at breakfast (6–8 am) on empty stomach. 150 mg armodafinil achieves peak by 9–10 am and sustains focus 12–15 hours. If dosed after 11 am, expect sleep disruption. Empty stomach optimizes absorption; food delays by ~30–60 minutes.
• Smoother than modafinil (Modalert). Pure R-enantiomer eliminates the S-isomer's jitteriness and anxiety. No "crash"—effect gently tapers as half-life extends. Headaches rare (vs Modalert's 10–15% rate).
• Enhances focus, not sleep. Armodafinil promotes wakefulness—you still need sleep at night. Most people find 150 mg maintains clear cognition for high-demand work (writing, coding, analysis). Not a substitute for rest.
• Tolerance rarely develops with consistent use. Daily armodafinil maintains efficacy 6+ months; some users report stable effect after 2–3 years. Unlike stimulants, armodafinil doesn't downregulate dopamine receptors with chronic dosing at this dose.

Pharmacology

How armodafinil works

Armodafinil is the pure R-enantiomer of modafinil, offering a cleaner pharmacokinetic profile. It crosses the blood-brain barrier selectively and acts on wake-promoting pathways with extended duration, resulting in a smoother cognitive curve without the intensity spike or crash of racemic modafinil.

Selective DAT Inhibition

Pure R-enantiomer means cleaner dopamine transporter binding. Produces wakefulness without euphoria or significant abuse potential.

Orexin Pathway Activation

Extended activation of orexin neurons in the hypothalamus. Same pathway as modafinil but with sustained duration—no mid-afternoon dip.

Prefrontal Cortex Enhancement

Enhances executive function and working memory through extended noradrenergic and dopaminergic signaling in frontal regions.

Pharmacokinetics

How your body processes it

Armodafinil is the R-enantiomer of modafinil—the pharmacologically active form. It exhibits a longer, smoother half-life than racemic modafinil, with a delayed Tmax that contributes to its gentler plasma curve. Understanding these parameters helps optimize dosing and minimize potential timing-related side effects.

Bioavailability	~80% (oral)
T_max (time to peak)	2 h (fasted) / 4.5 h (fed)
Elimination half-life	12–15 hours (R-enantiomer, longer than racemic modafinil)
Protein binding	~60% (primarily albumin)
Metabolism	Hepatic — CYP3A4/5 (primary), CYP2C19. Moderate CYP3A4 inducer.
Excretion	Renal (~80%), <10% excreted unchanged
Food effect	Food delays T_max significantly (fasted 2h vs fed 4.5h). Reduces GI distress but delays peak effect.
Steady state	Achieved in 2–4 days with daily dosing

Source: Darwish et al. 2009 (PMID: 19663523) — comparative armodafinil/modafinil PK study

Dosing

Optimal protocol

Your prescribing physician will determine the final dosing schedule. These are evidence-based guidelines commonly used in clinical practice for armodafinil 150mg.

Timing

Take once daily in the morning, ideally between 7–9 AM. The 12–15h half-life means a 7 AM dose clears by 10–11 PM, protecting sleep quality.

RECOMMENDED

With food?

Can be taken with or without food, but food significantly delays peak (fasted: 2h vs fed: 4.5h). Taking with light breakfast reduces nausea; taking fasted produces faster onset.

FLEXIBLE

Advanced dosing

Some advanced users prefer 75mg + 75mg (split dose 7 AM and 10 AM) to flatten the plasma curve and reduce peak-related side effects. Discuss with your physician.

ADVANCED

Cycling

Not pharmacologically required—no tolerance to wakefulness effects in clinical studies. However, many biohackers prefer 5-on/2-off (weekdays) to maintain consistent response.

OPTIONAL

Evidence

Published research

Armodafinil is one of the most well-characterized wakefulness-promoting agents, with robust clinical evidence from narcolepsy, SWSD, and healthy cognitive enhancement studies.

2009 Journal of Clinical Pharmacology PMID: 19663523

Comparative Pharmacokinetics of Armodafinil and Modafinil

Darwish et al. demonstrated that single-dose armodafinil 150mg produces similar Cmax to modafinil 200mg but with a longer Tmax (2–4.5h vs 2–4h) and extended half-life. The R-enantiomer accounts for the longer duration of action.

PHARMACOKINETIC STUDY

2006 Sleep PMID: 16876144

Efficacy of Armodafinil in Shift Work Sleep Disorder

Harsh et al. conducted a randomized, double-blind trial in patients with SWSD. Armodafinil 150mg showed significant improvement in wakefulness, fatigue, and cognitive performance compared to placebo. Effects were sustained across the dosing period.

RANDOMIZED CONTROLLED TRIAL

2015 European Neuropsychopharmacology PMID: 26137838

Modafinil for Cognitive Neuroenhancement (Systematic Review)

Battleday & Brem's systematic review of 24 studies found modafinil and armodafinil consistently enhance attention, executive function, and learning in healthy individuals. Armodafinil's longer half-life allows sustained cognitive benefits with once-daily dosing.

SYSTEMATIC REVIEW — 24 STUDIES

Safety

Side effects & safety

Armodafinil's safety profile mirrors that of modafinil, with incidence rates derived from controlled clinical trials. The smoother plasma curve may reduce stimulant-type side effects compared to racemic modafinil.

Headache

17%

Nausea

Dizziness

Insomnia

Dry mouth

Fatigue

Rare but serious

Stevens-Johnson Syndrome (SJS) and angioedema have been reported at an estimated incidence of <0.001%. Discontinue immediately if you develop a rash, mouth sores, or facial swelling. Contraindicated in patients with hypersensitivity, cardiac arrhythmias, or left ventricular hypertrophy.

Interactions

Drug interactions

Armodafinil is a moderate CYP3A4 inducer and CYP2C19 inhibitor. This affects metabolism of several common medications. Your prescribing physician will review your full medication list.

Oral contraceptives (ethinyl estradiol)

Armodafinil induces CYP3A4, reducing contraceptive efficacy by ~18%. Use alternative or additional contraception during treatment and for one month after stopping.

Mechanism: CYP3A4 induction → increased estrogen clearance

Warfarin

Armodafinil inhibits CYP2C9, which metabolizes warfarin. This may increase warfarin exposure and INR. Monitor INR more frequently if combining.

Mechanism: CYP2C9 inhibition → decreased S-warfarin clearance

Diazepam / Omeprazole (CYP2C19 substrates)

Armodafinil inhibits CYP2C19, potentially increasing levels of these drugs. Monitor for increased sedation or acid suppression effects.

Mechanism: CYP2C19 inhibition → decreased substrate clearance

Caffeine

Synergistic wakefulness effects. No direct pharmacokinetic interaction. Combined use may increase anxiety or insomnia in sensitive individuals. Consider reducing caffeine by 50% when starting.

Mechanism: Additive adenosine antagonism + orexin/DAT activation

FAQ

Common questions

Is armodafinil different from modafinil?

Yes, fundamentally. Modafinil is a racemate (50% R + 50% S enantiomers). Armodafinil is the pure R-enantiomer—the active form. This means armodafinil offers a longer half-life (15–18h vs 12–15h), more gradual onset, and smoother effects. Many users prefer the gentler curve and absence of peak-induced jitteriness.

Is armodafinil legal in India?

Yes. Armodafinil is a Schedule H drug under the Drugs and Cosmetics Act 1940—legally available with a valid prescription from a registered medical practitioner. It is NOT a narcotic or controlled substance under the NDPS Act.

What are common side effects?

Generally mild and dose-dependent. Most common: mild headache, nausea (especially on empty stomach), insomnia if taken late, or occasional dry mouth. Serious adverse effects are rare. Your physician will discuss individual risk factors during consultation.

When should I take armodafinil?

Take armodafinil in the morning or early afternoon (before 2 PM) to avoid sleep interference. With food if sensitive to nausea. Because of the extended half-life (15–18h), taking it too late can disrupt sleep quality—unlike modafinil, which can be taken until mid-afternoon.

Why 150mg instead of modafinil's 200mg?

Due to the higher potency of the R-enantiomer, 150mg armodafinil is roughly equivalent to 300mg modafinil. Starting at 150mg is both cost-effective and avoids unnecessary dosing. Many users find 150mg provides the desired effect with a lower risk profile.

What's included in the ₹1,999/month protocol price?

The monthly protocol price includes the doctor consultation, prescription issuance after evaluation, armodafinil medication (typically a month's supply), and delivery to your door within 48 hours. No hidden fees—what you see is what you pay. Your doctor may adjust dosage or medication based on individual health factors during consultation.