TempoLife › Features › When a caffeine dose is approximately half gone
When a caffeine dose is approximately half gone
When a caffeine dose is approximately half gone: eighty pages combine common doses from 20–400 mg with intake times across the day and show a range of…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
Eighty pages combine common doses from 20–400 mg with intake times across the day and show a range of remaining caffeine after 2, 4, 6, 8, 10 and 12 hours. The model exposes its assumed half-life instead of predicting sleep, provides separate evidence notes for pregnancy, smoking, oral contraceptives and interacting medicines, and refuses to turn population pharmacokinetics into a personalised clearance promise.
How to use it
Use When a caffeine dose is approximately half gone as an index across related cases. The consolidated page establishes the shared method first; narrower pages should appear only when they can add case-specific data rather than repeat a template.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | kui kaua kofeiin kehas püsib |
| Finnish | paljonko kofeiinia jäljellä 8 tunnin jälkeen |
| Russian | через сколько кофеин выводится |
| English | caffeine remaining after 8 hours |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: EFSA caffeine opinion (official) and published pharmacokinetic reviews; exponential-decay curves computed with visible assumptions. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
/caffeinein determines the starting amount; this visualises an uncertainty range over time and does not forecast an individual's sleep.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Caffeinein
Continue to the related TempoLife reference.
Coffee
Continue to the related TempoLife reference.
Why it belongs on TempoLife
/caffeinein, /coffee and /sleep.
Frequently asked questions
What does this guide cover?
Eighty pages combine common doses from 20–400 mg with intake times across the day and show a range of remaining caffeine after 2, 4, 6, 8, 10 and 12 hours. The model exposes its assumed half-life instead of predicting sleep, provides separate evidence notes for pregnancy, smoking, oral contraceptives and interacting medicines, and refuses to turn population pharmacokinetics into a personalised clearance promise.
What evidence does it use?
EFSA caffeine opinion (official) and published pharmacokinetic reviews; exponential-decay curves computed with visible assumptions.
Where does this guide stop?
/caffeinein determines the starting amount; this visualises an uncertainty range over time and does not forecast an individual's sleep.
Turn the reference into a routine
TempoLife brings food, movement, sleep and everyday health habits into one private place when you want to track what happens next.