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Low blood pressure after starting oral minoxidil – what I noticed

Posted by greg208 in Safety & Side Effects - 1 points, 3 comments.

5 mg oral minoxidil once a day after seeing a post that said it could help with hair loss without the usual scalp itch. Within a couple of weeks I began feeling a bit light‑headed when I got out of bed, and one morning I actually fainted a few feet from the bathroom. I bought a cheap home BP cuff, and my reading was 110/70 while my usual is around 125/80.

I cut the dose to 1 mg and the symptoms went away. I still keep the topical 5 % on the scalp because I don’t want to risk more scalp irritation. I’ve noticed I need to drink more water and add a pinch of salt to my breakfast to stay steady.

I’m-tab wondering if anyone has tried a different taper or added something to buffer the drop incycl. No other meds, just the minoxidil. Any advice on safe long‑term use would be appreciated.

Comments

  • liam_sleepnerd: 5 mg for a few weeks, my morning BP dropped from ~128/82 to about 108/68 and I felt a bit woozy standing up fast. 5 mg cleared the light‑headedness and I kept the topical 5 % on my scalp. Adding a little extra sodium and sipping water throughout the day helped keep my readings stable, just like you noted. I’d keep logging your BP and symptoms, maybe check electrolytes occasionally, and stay under the dose that keeps you asymptomatic. Always run any changes by your clinician, especially if you’r
  • greg208: Thanks for the detail, Liam. I noticed the same drop to around 110/70 and got faint once, which is why I cut to 1 mg, no more symptoms. I’ll keep logging BP like you suggested and add a pinch of salt to breakfast. Do you happen to check serum sodium or potassium when you taper, and how often do you do itWorking out the exact electrolyte tip would help me set a safe protocol.
  • greg208: Not gonna lie, I had the same woozy feel at 5 mg. Dropping to 1 mg fixed it, but I still keep the 5 % topical. I’ve started adding a pinch of sea salt and staying hydrated, and my mornings have gotten a lot steadier. Thanks for the electrolytes reminder – I’ll check those too.

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