what's your first otc medicament for a headache?

Excedrin = Aspirin + Tylenol + Caffeine
- Mine is excedrin and a big ass cup of coffee

95% of the time, a headache for me means I'm dehydrated. So I drink water + electrolyte drops.

Ibuprofen if I’m at work, but at home I usually take a short nap and have some coffee after, which works better for me.
- If it's early and I'm under caffeinated, then I drink more coffee. If that doesn't help or apply, then I assume I'm dehydrated and drink water. If that doesn't help I try to take a nap. Usually by the time I run down the checklist it's close enough to bedtime that I just turn in early. If none of that helps and/or I have stuff to do, then I reach for ibuprofen just because we are more likely to have that on hand than Tylenol.

I'll go plain old paracetamol which works for me most of the time. If that fails then ibuprofen would be my next choice.
- Paracetamol is acetaminophen (Tylenol) for those of us in the States.
  Cheers!

It depends on the cause, and your own biology.
Aspirin reduces pain signals but also reduces blood clotting, If your headache is from vasculature issues in and around your brain it's extra insurance.
Acetaminophen just reduces pain signals in the nervous system. It doesn't have any secondary advantageous effects but it is easier on your stomach.
Ibuprofen reduces pain signals and also as an anti-inflammatory. So if your headache is caused from minor swelling in the head it's the obvious choice.
I feel like at least in the US most people tend to overtake ibuprofen when they'd probably be better suited with Tylenol or aspirin.

I try to figure out what's causing it, then treat. I get headaches from eyestrain (so I take addition and focus on something else), allergies (antihistamine/decongestant), sunglare (eyerest), overexertion/dehydration (drink water and take it easy), caffeine withdrawal (drink cola), etc.

Motrin(Ibuprofen) because it works better for me, assuming the migraine doesn't cause me to puke it up right after.
Aspirin has never been of value to me and I would only take it if I had a heart attack.

I'm in too much chronic spinal pain to register a headache. I don't know why, but the question made me realize I haven't had a headache in a decade since my broken neck and back. I get to a point where I can't focus on anything. The anti inflammatory Tylenol Arthritis formula is the most effective by a considerable margin. I don't have arthritis and am 40. I've been on most available pain meds over the last decade, and honestly this one beats most others for me. I used to have headaches, my issues are different but my family basically switched to the same thing too after trying it.
- Meloxicam has been a major help in managing my back pain. It's not recommended to take it regularly since it can cause digestive ulcers like high doses of ibuprofen. But I get bad flare ups with travel and meloxicam is very effective at helping me avoid a flare up.
  It might be worth asking your doctor about if they haven't had you try it before.

Whichever is closest.
Acetaminophen kills your liver. Ibuprofen melts the glue holding your guts together.
What matters right now is your headache.

I default to ibuprofen. Feels a little more effective to me than acetaminaphen. I've never taken aspirin for pain.

I prefer paracetamol since ibuprofen can create secondary effects in the gastric system.

Acetaminophen (Tylenol) if I can't get it under control without meds but I agree with the other posters about trying to figure out the root cause! For me, the main causes of headaches used to be hormones from the pill until I switched to a different form of birth control (IUD). Nowadays my headaches are mostly dry eye or allergy related so I keep eye drops on hand and take allergy meds and I'm down to headaches once every week or two. Staying hydrated and taking fish oil supplements has also helped my dry eyes.

I just deal with it unless it's a migraine.
- How do you recognize your migraine? And what do you take for it?
  
  I notice changes in sensory processing first. Reading becomes difficult and my eyes lose focus easily/take a long time to focus. I also notice a difference in my thought patterns. My thoughts start to kind of skip around. It becomes hard to concentrate on any single thing, but not in a distracted kind of way. I very much realize that this description is vague and probably doesn't make sense unless you experience similar migraines. I do also experience visual auras, but those aren't apparent until the migraine is about to become very painful.
  A full blown migraine manifests as sensory processing mapping to pain. Light and sound are unbearable even in relatively moderate amounts. One of the worst migraines I had led to the pressure of my head on the pillow making every hair follicle feel like a a needle poking my scalp. You don't realize how much your brain autonomously filters out tons of sensory input to keep your focus on a very small slice of interest until the filters break down and let everything through.
  Over the counter pain pills do nothing for my migraines. Sensory deprivation and sleep are the only things that can actually stop a migraine for me. I have blackout blinds, a well fitting eye mask, and foam earplugs ready to go. Early detection is very important. If I act as soon as I notice the warning signs, I can usually avoid a full blown migriane. A large glass of water + darkness and silence will usually have me back up in less than an hour. If a migraine gets to the point of pain, I will need sleep to get rid of it and will still feel rather off afterwards. Also falling asleep with a brutal migraine is no easy feat. A catch-22 so to say.
  
  Many people have auras before and during migraines. These can be visual (seeing colors or black spots or colors/lights look brighter or dimmer), sensory (sensitivity to light/sound), speech-related (difficulty speaking or understanding speech), motor (impairment to movement), and brainstem (vertigo, tinnitus, ataxia, decreased consciousness, etc).
  I get sensory, speech related, motor, and possibly some brainstem aura symptoms. You kind of just learn to recognize when a migraine is coming on and not a regular headache.
  
  My migraines are actually usually without headache, just a lot of aura. That might sound not so bad, but it's pretty bad.
  They tend to start a bit insidiously, with a little bit of sensitivity to light and sound and, even more so, frequently changing or bright light and fast sound.
  That's when things start to feel overwhelming in my head, so if I'm not being obtuse, I recognize that it's time to take medication. Sometimes my partner realizes it before I do because I'll start covering my eyes and just mildly complaining about things being too bright or too much.
  Anyway, at that point I take sumatriptan. It requires a prescription, but it's not expensive. It works like magic for me.
  Before I found sumatriptan, I would have to be in a dark, silent room with my head in a pillow.

this is the only thing i found that knocks out a persistent migraine. 1 asprin 1 tylenol 1 aleve and a cup of coffee. about a half hour later the pain and nausea finally stop.
- 1 asprin [...] 1 aleve ...
  That combination of two non-steroidal anti-inflammatories is probably knocking out more than you think.

I have never in my life heard "medicament" before. Is there a particular reason that word was used here? Is it used often across the pond or something and I just never heard it somehow? Or is it somewhat seldom used and you just decided that was the word you wanted to use?
- French?
  
  Didn't even notice the word the first time around, and before I read your replying assumed it was a portmanteau of medication and predicament. French could work. Dunno why the loan word though.

I pretty much always go ibuprofen, but aspirin is fine.
I'm pretty sure acetaminophen is snake oil though (this is a joke but I can't recall ever having it resolve a headache for me like ibuprofen does).
- Might not be snake oil, but that shit is bad for you. If it came out today it wouldn't be sold OTC.
  
  Yep. Got diagnosed with a genetic liver issue and the immediate rule from the doctor was "Nothing with acetominophen ever again. You can probably get away with a (alcoholic) drink or two a week, but don't even think about acetominophen."
  My dumb ass had been practically living off Day and Nyquill.

As other comments have said, deal with the origin of the pain first, THEN...
If it's bad enough to take meds but not too bad, then one 500mg paracetamol and 200mg ibuprofen (my go to for pain). The paracetamol will generally be one with some caffeine in it.
If it's a BAD headache, then 900mg aspirin.
I do have a headache hat which is kept in the fridge.

Somewhat in order of action:
check if I am clenching jaw/grinding my teeth, relax shoulders and neck, center my thoughts, lower blood pressure and pulse
thoroughly flush sinuses (like spend 20 minutes or more at least)
drink lots of water/electrolytes and caffeine
reduce sensory input: dark quiet room with comfortable seating
double dose of Sudafed and Diclofenac sodium
jump into traffic

Ibuprofen for tension headaches, acetaminophen for the rest.

Ibuprofen or paracetamol

- Tylenol is scary! But I've started using it because naproxen is fucking up my stomach.
- Aspirin is an NSAID

If I can't avoid it or if I'm in a hurry, I will take Paracetamol 500mg. If there is no change within an hour, I'll take Ibuprofen 600mg. But if I have time, I will get some rest (avoid bright light, close eyes and listen to podcasts).
- Known as acetaminophen (Tylenol) in the US

Used to be ibuprofen but I gained an allergy to it so now it's acetaminophen (Tylenol)

acetaminophen is my go to for that.

Ibuprofen but in ideal conditions cannabis

Usually aspirin for headaches Ibuprofen for everything else especially for inflammation

Dipyrone. It's OTC here in Brazil, but it seems to be restricted in other places.

depending on severity, advil extra strength liquigels for a quick onset headache. If it won't go away then another advil with a Tylenol at the same time, I call it Advenol.

Well, I'm not in a situation where I can go otc for headaches. I'm already using acetaminophen (paracetamol for the brits) non stop for chronic pain, and I have to save ibuprofen for stuff that never responds to other pain control methods because I'm an old fuck and I'm not supposed to take it at all, and it causes problems when I ignore that and take it anyway.
Luckily, my headaches almost always stem from stress and/or muscle tension in my neck, so it's very rare they don't respond to non chemical methods, and I happen to have prescription meds that are prn for those things if I want/need.
But, for headaches, I used to find caffeine more effective than analgesics, nsaid or otherwise. Even when I wasn't drinking caffeine regularly (which means I know that it wasn't just caffeine withdrawal causing the headache to begin with), a cup of coffee usually got rise of a headache faster and more thoroughly than NSAIDs.
But it was usually acetaminophen that would be my first pick when I went the OTC pill route. Less likely to irritate my already irritating bowel syndrome issues.
Tbh though, none of the OTC analgesics are great at getting rid of a headache. Some of the older studies and double blind tests I saw put them about the same as placebo for headaches, though that's been years since I looked up anything about it.

Aleve (naproxin sodium) is the only OTC painkiller that reliably works for me. So first I take one, and if that doesn't work after an hour or so, I take another and a nap.

Naproxen is my number one go-to answer for any sort of minor aches and pains. Headache? Cured. Muscle pains? It doesn't get rid of them, but it does make it a lot less noticeable. Hangover, stomach ache, stubbed toe, hurt feelings? Naproxen has you covered. Love that stuff.
It will, however, cause internal bleeding if you drink alcohol while on it. So maybe don't do that. I don't drink so I love the stuff.

Ibuprofen, but hardly ever because near 100% of my occasional headaches are migraine so I use sumatriptan (which is prescription here). Because no painkiller works for those, but 6mg of intramuscular sumatriptan knocks them out 99% of the time.
Never Tylenol/paracetamol because it has never worked for me at all for any pain. Not headache not any other pain. Like zero effect, I just feel vaguely poisoned.
Never naproxen because I puke it up - I tried it first for a migraine and assumed I'd just vomited because migraine. But later tried it for a knee injury and nope, puked it right out again.
So for the rare not migraine headache that doesn't just go away by itself, ibuprofen because it does work.

Not OTC: water and exercise. But hey, keep searching for the "easy" way out.
- How unnecessarily condescending.
  Are you feeling ok? Do you have a headache that's making you grumpy?
  
  It's easier to block the sentient skid marks so they only have one another to argue with.
  
  That's my take. Take it or leave it.