Prescription drug Published: RCT evidence Extensive real-world use

Losartan: dosing, timing and what to expect

ARB for blood pressure — the no-cough alternative to ACE inhibitors, and the one the longevity community reaches for.

Also known as Cozaar

Educational research reference Prescription Medications

Quick reference. Everything you need to run Losartan — dosing, frequency, reconstitution math for the vial sizes people actually buy, and what it stacks with. For anything specific to your situation, ask the Guru.

Losartan quick start

Route: Oral
Typical dose: Physician-set — commonly 25–100 mg/day
Frequency: Daily
Half-life: ~2 h, active metabolite 6–9 h.
Cycle: Continuous under physician supervision.

These are the numbers people actually run, drawn from the published record and from what the community has settled on over time. Educational reference, not medical advice — a starting point to work from, and one you can adjust as you learn how you respond.

How to run it

How often: Daily
Cycle length: Continuous under physician supervision.
Half-life: ~2 h, active metabolite 6–9 h.
Route: Oral

Consistency matters more than perfect timing. Pick a slot in your day you will actually keep, and let DoseIQ handle the rest.

What to expect

Most people tolerate Losartan well. Here is what is worth knowing going in, so nothing catches you by surprise.

Same potassium note as ACE inhibitors.

Known interactions

Interactions involving Losartan's drug class that DoseIQ screens for. Each one cites where it comes from — an FDA label section or the published record — because an interaction warning you can't trace is just noise.

Serious Lithium + ACE inhibitors/ARBs — lithium levels rise

Both drug classes reduce lithium clearance — a well-documented toxicity route.

What to do: This combination is managed with more frequent lithium levels — make sure the prescriber managing each drug knows about the other.

Source: FDA label, lithium §7

Caution NSAIDs + blood-pressure medication — kidney stress

NSAIDs constrict the kidney's inflow while ACE/ARBs relax its outflow — regular use together stresses filtration, especially with a diuretic in the mix.

What to do: Occasional NSAID use is fine for most; regular use deserves a prescriber conversation and a kidney panel.

Source: FDA labels, NSAID class §7 (the "triple whammy")

Caution Spironolactone + ACE/ARB — potassium climbs from both

Both raise potassium; together they can push it high enough to matter.

What to do: A periodic potassium level is the whole answer — cheap, and your prescriber will agree.

Source: FDA label, spironolactone §7

Worth knowing PDE5 + blood-pressure medication — additive lowering

Usually fine and often co-prescribed, but stacked vasodilation can show up as lightheadedness.

What to do: Rise slowly; mention dizziness to your prescriber.

Source: FDA labels, sildenafil/tadalafil §7

DoseIQ screens your whole protocol against these rules automatically — every compound, prescription and supplement you track, cross-checked as you add them. Serious flags are always free.

Preparing it

Losartan does not need reconstituting — it comes ready to use.

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This page is an educational research reference and is not medical advice. Dose figures reflect the published record and what the community has converged on — starting points to weigh, not instructions. Consult a qualified healthcare provider before starting any protocol.