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AI Analysis
AI timing recommendation
Coming soon — needs 14+ days of data
Pattern analysis
Coming soon — needs 14+ days of data
About your medications
Vyvanse is a prodrug — your body converts it gradually in your red blood cells, which is why it feels smooth and steady. It holds a fairly flat plateau for several hours before dropping off steeply.
Ramp up takes ~90 minutes. A high-fat meal can delay this by up to an hour.
The crash is real and documented — a steep pharmacological drop, often just 15–30 minutes from fine to terrible. Not a mood problem.
Adderall IR releases the full dose at once — rises quickly, peaks, and fades in a smooth bell shape. Its fast onset is exactly what makes it useful as a booster: it can be timed to catch the Vyvanse drop before the crash hits.
Timing is everything. Adderall IR needs to be taken before the crash begins — not after. Once the crash hits, it can shorten it but can't prevent it.
Sleep matters. Clinical guidance recommends no later than 6 hours before bedtime.
How DoseLog calculates your suggested Adderall time
At launch these numbers use clinical averages. As Julia logs more data, the recommendation will adjust to her real patterns — labeled clearly as "based on your data."
Food before Vyvanse — a high-fat meal can delay onset by up to an hour, shifting your whole day's timing.
Vitamin C and citrus — taken close to an Adderall dose, acidic foods can reduce absorption.
Your metabolism — clinical averages are starting points. Your logged data will reveal your actual patterns over time.
Research references
Vyvanse pharmacokinetics
1FDA Label — Vyvanse (2007)
Authoritative source for all Vyvanse PK defaults
fda.gov ↗
2Drugs.com — Lisdexamfetamine Monograph
Food effect and absorption detail
drugs.com ↗
3ScienceDirect — Lisdexamfetamine Overview
Confirms smooth onset and plateau shape
sciencedirect.com ↗
4DrOracle — Duration of Action of Vyvanse
14-hour clinical duration; individual variability
droracle.ai ↗
Adderall IR pharmacokinetics
5FDA Label — Adderall IR
Baseline for all Adderall IR PK defaults
fda.gov ↗
6FDA Label — Adderall XR (IR comparison)
Validates IR bell-curve shape
fda.gov ↗
7HealthCentral — What You Need to Know About Adderall
Felt onset vs plasma peak distinction
healthcentral.com ↗
8DrOracle — Duration of Action of Adderall IR
Real-world felt duration shorter than half-life implies
droracle.ai ↗
Booster dose timing
9DrOracle — Adderall IR Booster Added to Vyvanse
Basis for 2:00 PM hard limit in recommendation engine
droracle.ai ↗
10DrOracle — Managing Vyvanse Crash with IR Booster
Confirms timing formula and crash as pharmacological event
droracle.ai ↗
11Children's Hospital of Pittsburgh — ADHD Medication Basics
Institutional validation that Julia's regimen is standard-of-care
chp.edu ↗