Most people expect modafinil to affect their energy levels. Fewer expect it to affect their digestion. Yet questions about diarrhea, bloating, abdominal pain, reflux, and IBS flare-ups appear regularly in modafinil communities. Irritable bowel syndrome (IBS) commonly involves abdominal pain, bloating, and changes in bowel habits. Several of modafinil’s documented side effects overlap with symptoms…

Headache is one of the most commonly reported side effects of modafinil. On the surface, that seems like it should make questions about migraine straightforward. It doesn’t. Talk to migraine sufferers who have taken modafinil and you’ll hear very different stories. Some report that their attacks became more frequent or more severe after starting the…

A lot of people taking modafinil describe the same thing: feeling unusually hot, sweating through shirts, waking up drenched at night, or becoming miserable in temperatures they used to tolerate easily. The complaints show up repeatedly in narcolepsy communities, modafinil discussions, and patient forums. Some people describe facial flushing that appears at roughly the same…

More hair in the shower than usual. More on the pillow. A temple that looks different under the bathroom mirror than it did a few months ago. Then the thought: when did I start the modafinil? Search it and you will find other people asking the same thing. Similar timelines, similar details — temples, shedding,…

Modafinil is usually discussed as a productivity drug, not a sexual one. Most conversations around it focus on wakefulness, focus, and long work sessions. But a small number of case reports and patient anecdotes have described something unexpected: some men report improvements in libido, erections, or sexual functioning while taking the drug. The reports are…

Few prescription drugs have developed an internet reputation quite like modafinil. Originally developed to treat narcolepsy and other sleep disorders, it gradually moved beyond medical use and started showing up in startup forums, poker communities, biohacking blogs, and eventually podcasts with millions of listeners. Somewhere along the way, the drug stopped being known primarily as…

People online often talk about “the afinils” as though they constitute a single category of drug. In practice, the compounds occupy very different scientific and regulatory worlds. Modafinil and armodafinil are prescription medications with established medical uses, clinical trial records, pharmacokinetic data, adverse-event monitoring, and decades of regulatory scrutiny. Adrafinil sits in murkier territory —…

Most drugs have a story. Modafinil’s is stranger than most. It started as a narcolepsy treatment — a way to keep people with a debilitating sleep disorder functional during waking hours. The FDA approved it in 1998. Unremarkable so far. But then the U.S. Air Force started issuing it to pilots on long-duration missions as…