Medication, rebound, and the daily cycle
medication
The medication wears off and everything changes. The regulated child from school is gone and in their place is someone weepy, raging, or feral with hunger. Or your own medication wore off and the patient parent from 3pm is nowhere to be found at 5pm.
What is happening in your brain
Stimulant medication works by increasing dopamine and norepinephrine availability in the prefrontal cortex. When the dose wears off, these neurotransmitters drop, sometimes below the pre-medication baseline temporarily. This rebound dip is pharmacological, not behavioural.
The rebound window typically lasts 30 to 60 minutes. During this time, emotional regulation, impulse control, and frustration tolerance may be worse than if the person were completely unmedicated. The medication giveth and the medication taketh away.
Appetite suppression is the most common stimulant side effect. The hunger signal is chemically overridden during the active dose. When it returns, it arrives at full intensity. The child who ate nothing all day is now ravenous and dysregulated at the same time.
What is happening in your child's brain
Your child does not understand the rebound. They were fine and now they are not, and the shift feels scary and confusing. They did not choose to crash. Their brain lost the chemical support it had all day. Telling them to calm down during a rebound is asking them to regulate with even fewer resources than usual.
The dual-ADHD dynamic
If parent and child are on different medication schedules, their rebound windows may overlap, creating a house with zero regulation for 30 to 60 minutes. If you can, stagger the timing so at least one regulated adult is available during the child's rebound. Talk to both prescribers about extended-release options or afternoon boosters.
What actually works
- Know the rebound window and plan around it. Lower demands, higher snacks, minimal transitions during that 30 to 60 minutes.
- Large protein-heavy breakfast before the medication kicks in. Protein-dense snack ready for when it wears off.
- Do not try to do homework, chores, or have important conversations during the rebound. Wait 60 minutes.
- Track: time of dose, time of crash, mood, appetite, sleep. This data helps the prescriber adjust. You cannot optimise what you do not measure.
- If your own medication wears off before theirs, talk to your prescriber about extending your coverage through the parenting hours.
Scripts
During the child's rebound
"Your brain is adjusting right now. Let us just be quiet for a bit. Snack?"
When wondering about the dose
"I am going to write down what I noticed today and talk to the doctor about it."
What your partner needs to know
They may not understand the pharmacological cycle. What they need to know: the 5pm crash is predictable and temporary. It is not the child's real personality. It is a medication transition. The household needs to plan around it the way you plan around a toddler's nap schedule.
When to get more help
If the rebound is severe, if appetite suppression is affecting growth, or if sleep is consistently disrupted by the medication, these are prescriber conversations. Medication adjustment is normal and expected. The first dose and timing are rarely the final answer.
Related in-the-moment cards
- The 5pm crash when the meds wear off
- They're hungry and feral now the meds are gone
- I can't tell if this is the meds or just a bad day
- Medication timing making home worse than work
- I couldn't fill their prescription and tomorrow is an unmedicated day
- I forgot to reorder the meds in time
- They won't eat on the medication and it scares me