Blood Pressure Pills Worked the Same at Bedtime as in the Morning

CATEGORY: HEART & CIRCULATION

Switching blood pressure pills to bedtime changed nothing the BedMed trial could measure. Over a median of 4.6 years, 2.3 of every 100 bedtime dosers per year died or went to hospital with a stroke, heart attack or heart failure. Among morning dosers the figure was 2.4.¹ Nighttime dosing wasn’t safer, and it wasn’t riskier either.

A Theory With Real Appeal

The idea had logic behind it. Blood pressure normally dips overnight, and people whose pressure doesn’t dip have more heart trouble, so covering the night hours with medication sounded protective. Canadian family doctors put it to a proper test. Across 436 primary care practices in five provinces, 3,357 adults already taking a once-daily blood pressure pill drew their dosing time at random: 1,677 moved the pill to bedtime and 1,680 kept it in the morning. Everyone knew their own schedule, but deaths and hospital visits were tallied from health records, which don’t care what anyone believed. The average participant was 67.

No Benefit, and None of the Feared Harms

The gap between 2.3 and 2.4 events per 100 people per year is small enough to be chance. The pieces of the composite looked the same one by one. So did the harms that make some doctors wary of nighttime dosing: falls, fractures, new glaucoma diagnoses and cognitive decline all came out level. A companion trial asked the question where those worries run highest, in 776 nursing home residents with a median age of 88, most living with dementia. Bedtime dosing made no difference to deaths or major heart events there either.²

Three Trials, One Answer

BedMed is the third large randomized test of pill timing, and the answers now rhyme. A UK trial of more than 21,000 adults with hypertension reported the same result in 2022: evening and morning dosing protected hearts equally well.³ An editorial accompanying the new trials argued that they put the old morning-dosing maxim to rest, and that the clock matters less than finding a time a person can actually stick to. For anyone who has ever juggled a pill organizer, that’s a quietly useful kind of news. One less rule to keep.

Key Takeaways

• Bedtime and morning dosing produced the same rate of death and major heart events: 2.3 versus 2.4 per 100 people per year across nearly five years.
• The harms sometimes blamed on nighttime dosing, including falls, fractures, glaucoma and memory decline, were no more common at bedtime.
• The same answer has now come from three randomized trials in three settings: Canadian primary care, UK outpatients and Canadian nursing homes.

References

1. Garrison SR, Bakal JA, Kolber MR, et al. Antihypertensive Medication Timing and Cardiovascular Events and Death: The BedMed Randomized Clinical Trial. JAMA. 2025;e254390. link
2. Garrison SR, et al. Bedtime vs Morning Antihypertensive Medications in Frail Older Adults: The BedMed-Frail Randomized Clinical Trial. JAMA Network Open. 2025;8(5):e2513812. link
3. Mackenzie IS, Rogers A, Poulter NR, et al. Cardiovascular outcomes in adults with hypertension with evening versus morning dosing of usual antihypertensives in the UK (TIME study): a prospective, randomised, open-label, blinded-endpoint clinical trial. The Lancet. 2022;400(10361):1417–1425. link