Most advice about supporting people with ADHD at work is written for managers — accommodations, performance plans, the formal stuff. But the person who shapes a colleague's daily experience the most usually isn't their boss. It's you: the teammate in the next seat, the one on the same Slack thread, the one they're paired with on a project. Peers set the temperature of a workplace far more than org charts do.
The good news is that being a good coworker to someone with ADHD doesn't require special training or any disclosure conversation. It mostly requires noticing a few patterns and adjusting how you, personally, communicate. Here's what actually helps from the seat next to them.
Put the important stuff in writing
Your colleague with ADHD might nod along enthusiastically in a hallway conversation and have genuinely lost the entire thing by lunch. This isn't them not caring. ADHD affects working memory — the mental sticky note that holds information while you do something with it. Spoken instructions can evaporate before they're ever written down.
So when something matters, follow up in a channel that persists. After a verbal chat: "Quick recap so we both have it — you're taking the deck, I've got the data, due Thursday." You're not being condescending; you're being kind to a memory system that drops things. Honestly, everyone benefits from this. You're just the person who made the implicit explicit.
A two-line written recap after a conversation is one of the most generous things you can do for an ADHD coworker — and it costs you fifteen seconds.
Be specific instead of vague
"Can you clean that up a bit?" is a nightmare instruction for an ADHD brain, which may now spiral through twelve interpretations of clean up and start none of them. Ambiguity is friction, and friction is where tasks die.
When you hand something off, name the concrete next action and the finish line: "Can you fix the three formatting issues in section two by end of day?" is something a person can actually start. You've removed the part where they have to first decode what you meant, then plan, then begin. You just handed them the on-ramp.
Don't read their style as their character
This is the big one, and it's where peers either help or quietly do harm.
A coworker with ADHD might interrupt because they'll lose the thought if they wait. They might reply to your message four days late and then instantly to the next one. They might be visibly bored in a long meeting, or fidgeting, or working with headphones and a wall of sticky notes. It's easy to read these as rude, flaky, or disengaged.
They're usually none of those things. They're the visible surface of a brain managing itself. The interrupting is fear of forgetting. The delayed reply is a task that fell into a blind spot, not a snub. The fidgeting is how they're paying attention, not evidence they aren't.
Assume competence and good intent. When you catch yourself building a story about a colleague being careless or not caring, hold it loosely. The most supportive thing a peer can do is refuse to quietly downgrade someone based on style.
Make collaboration ADHD-friendly without making it a thing
You can shape shared work in ways that help, no announcement required.
- Co-work in real time. Offer to hop on a call and knock out the boring task together. For many ADHD brains, body-doubling — just having another person present and working — is the difference between starting and not. Frame it as "want to power through this together?" not "do you need help."
- Break the shared deliverable into visible chunks. A giant "finish the report" is paralyzing. "You draft section one, send it over, I'll review while you do section two" gives momentum and frequent checkpoints.
- Send the meeting agenda beforehand, even informally. Knowing what's coming lets an ADHD brain show up regulated instead of ambushed.
- Notice the actual contribution out loud. "The way you reframed that problem in the meeting was sharp" lands differently than generic praise, especially for someone who's spent years bracing for criticism.
Protect their focus like it's a shared resource
Open-plan offices and a constant ping of messages are uniquely brutal for a brain that struggles to filter. You can be an ally here in tiny ways: batch your non-urgent questions into one message instead of five. Respect a closed door or headphones as the "deep work, don't interrupt" signal it usually is. Default to async for things that aren't actually urgent. None of this is special treatment — it's just not torpedoing someone's concentration when you don't have to.
A quick boundary note: being a supportive peer doesn't mean becoming someone's unpaid coach, covering for missed work indefinitely, or carrying their load. If a colleague is genuinely struggling, the kind move is encouraging them toward the people equipped to help — a manager, HR, or a professional — not absorbing it yourself. This isn't medical advice; it's about staying a good coworker without burning out.
Help the work live outside everyone's heads
A lot of what makes collaborating with an ADHD colleague smoother comes down to the same principle: get the shared plan out of memory and into something you can both see. When the recap, the next action, and the deadline live in a clear external system instead of in two unreliable heads, you both stop dropping balls. That's the whole idea behind tools like NoPlex — externalizing the moving parts so following through doesn't depend on anyone remembering perfectly. Be the coworker who writes it down. It's a small thing that quietly changes someone's whole week.