Diagnosis Before Medication: A PMHNP's Perspective

Many of the people I meet are already on medication when they arrive. They have been treated for a while — sometimes for years — and the treatment hasn't done what everyone hoped. The understandable instinct, theirs and often their previous prescriber's, is to ask which medication to try next. That is rarely my first question. Before I reach for a different prescription, I want to know whether the one they are on is aimed at the right thing.

It is an easy step to skip. A diagnosis gets made early, often in a brief visit, and from then on every decision is built on top of it — this drug, then that one, a dose up, a dose down — without anyone pausing to ask whether the original target was correct. A medication pointed at the wrong diagnosis will struggle no matter how carefully it is adjusted. So when treatment isn't working, I start by re-examining the diagnosis, not the drug list. Three patterns come up often enough that I look for them every time.

When bipolar depression has been treated as ordinary depression

This is the one with the highest stakes. Someone comes in carrying a long history of depression, has been on one antidepressant after another, and describes a frustrating cycle: a medication helps for a while, or not much at all, and then a switch, and another. On paper it reads as treatment-resistant depression. But antidepressant monotherapy is the right tool for unipolar depression — and when the picture underneath is actually bipolar, that tool tends to disappoint, and can sometimes make the mood less stable rather than more.

What I look for: the history that the depression story tends to leave out. I ask in detail about the up periods — stretches of unusually high energy, reduced need for sleep, racing thoughts, or a "best, most productive self" that ran a little too hot — and about whether any past antidepressant ever produced agitation, sleeplessness, or a sudden swing. Those clues are easy to miss when the visits are short and the conversation stays focused on the lows. When they are present, the target changes, and so does everything downstream of it. (More on this in why bipolar is so often missed and bipolar versus depression.)

When depression or anxiety has been treated as ADHD

Here the sequence usually runs the other way. The complaint is focus — someone can't concentrate, can't follow through — and at some point a stimulant was started to treat presumed ADHD. But difficulty focusing is one of the least specific symptoms in psychiatry. Depression drains concentration and motivation; anxiety pulls attention toward whatever the mind is bracing against. When the inattention is really being driven by an unsettled mood or an anxiety disorder, a stimulant rarely fixes it — and it can wind the anxiety tighter.

What I look for: whether the focus problem has been lifelong and present across every setting, the way ADHD is, or whether it tracks the mood and anxiety — worse when those flare, better when they ease. If there is no real childhood footprint and the attention complaint sits on top of an active depression or anxiety picture, I would rather treat the mood and anxiety first and re-check the focus afterward. Often the concentration returns on its own once the thing actually causing it is addressed. (I go deeper into this in five times "ADHD" wasn't ADHD.)

When a benzodiazepine has run for years without a first-line trial

The third pattern is quieter, and it accumulates one renewal at a time. Someone has been taking a benzodiazepine for anxiety or sleep for a long stretch — sometimes many years — and when I trace the history back, a first-line treatment for the underlying anxiety was never really tried, or never given an adequate run. The benzodiazepine works fast, the prescription keeps getting refilled, and the question of whether something better-suited for the long term was ever attempted simply never gets asked.

What I look for: whether the underlying anxiety has ever had a fair trial of the treatments best supported for ongoing use — typically a non-benzodiazepine medication paired with therapy — and what role the benzodiazepine is now actually playing. This is not about taking anything away abruptly; coming off these medications is a careful, gradual process and never something to do alone. It is about noticing a gap in the original plan and deciding, together, whether it is worth closing. (See deprescribing safely for how that unfolds.)

What "diagnosis before medication" actually looks like

In practice it is not dramatic. It mostly means slowing down and re-taking the history properly — the timeline, the order events happened in, the periods and details that a hurried first visit had no room for. I am listening for the clue that reframes the whole picture: the high that never got mentioned, the focus problem that only appeared alongside a depression, the first-line option that was skipped. None of this implies a previous clinician did something wrong. Diagnoses are made with the information available at the time, and more of it tends to surface once someone has the space to tell the longer version.

It also means being willing to hold steady before adding anything new. The reflex to do something — change a dose, layer on another medication — is strong on both sides of the visit. But when the diagnosis itself is in question, the most useful move is often to pause, clarify the target, and only then decide what the medication should be. A medication reassessment and a diagnostic clarification are really the same instinct applied from two directions: make sure the plan is built on the right diagnosis before building any further. (If you have already cycled through several medications, when the problem isn't the medication covers this directly.)

Sometimes the answer is the same medication

I want to be honest about where this lands, because it is not always a plot twist. A fair share of the time, the reassessment confirms the diagnosis that was already there. The medication someone is taking turns out to be the right one — it just needed a fuller dose, more time at that dose, or one thoughtful addition to finally do its job. In those cases I am not overturning anything. I am giving a reasonable plan the conditions it needed to work.

That outcome counts as a success, not a wasted visit. The goal of putting diagnosis before medication was never to change the prescription for its own sake. It was to make sure that whatever someone takes — whether it is something new or the very thing they walked in on — is aimed at the condition actually present. When the target is right, treatment that once felt futile often starts, at last, to move.

Quick answer: why the diagnosis comes before the prescription

When a psychiatric medication isn't working, the most useful first question is whether it is aimed at the right diagnosis — not which drug to try next. A treatment pointed at the wrong target tends to disappoint no matter how often it is switched. Three patterns recur: bipolar depression treated as ordinary depression (antidepressant monotherapy underperforms and can destabilize mood), depression or anxiety treated as ADHD (a stimulant doesn't fix focus that is really driven by mood or anxiety), and a long-term benzodiazepine with no adequate first-line trial (the underlying anxiety was never fully treated). Reassessing the diagnosis sometimes reveals a different target — and sometimes confirms the current one and simply optimizes it. Either way, getting the diagnosis right comes first.

At a glance

Pattern	What it often looks like	The clue I look for
Bipolar treated as unipolar	Antidepressant alone, partial or no response	History of highs, activation, or antidepressant-triggered swings
Mood/anxiety treated as ADHD	Stimulant for focus, mood or anxiety unchanged	Focus that tracks the mood, with no childhood footprint
Long-term benzodiazepine	Years of refills for anxiety or sleep	Whether a first-line, non-benzodiazepine trial ever happened

Frequently asked questions

Should I just try a different medication if mine isn't working?

Not before checking that the diagnosis is right. A medication aimed at the wrong target tends to disappoint no matter how many times it is swapped, so repeated non-response is itself a reason to revisit the diagnosis rather than only the drug. Sometimes the reassessment confirms the current target and the answer really is a dose or duration adjustment; sometimes it reveals a different target entirely. Either way, getting the diagnosis right comes first.

How does a wrong diagnosis lead to the wrong medication?

The clearest example is bipolar depression treated as ordinary depression. An antidepressant alone is a reasonable choice for unipolar depression, but when the underlying pattern is bipolar, antidepressant monotherapy often underperforms and can sometimes destabilize mood. The prescription was logical for the diagnosis on the chart — it just wasn't the right diagnosis. Correcting the target changes the whole treatment plan.

Does reassessing my diagnosis mean I have to stop my current medication?

Not necessarily. Reassessment is not the same as starting over. In a number of cases the diagnosis holds up and the medication is the right one — it simply needs a fuller dose, more time, or a small addition to do its job. The goal is never change for its own sake. It is to make sure every prescription is aimed at the condition actually present, even when that means confirming the plan you are already on.

Why was I kept on a benzodiazepine for years without trying anything else?

It often happens one renewal at a time, without anyone stepping back to ask whether a first-line treatment for the underlying anxiety was ever fully tried. Benzodiazepines can calm anxiety quickly, but for ongoing anxiety the better-studied long-term options are usually a non-benzodiazepine medication paired with therapy. When someone has been on a benzodiazepine for years and never had an adequate trial of those alternatives, that gap is worth examining as part of a medication reassessment — carefully, and never by stopping abruptly on your own.

If you're on medication that hasn't worked the way it should, a careful look at whether the diagnosis fits — before the next change — is often where progress finally starts.

Learn about medication reassessment

Written by Dr. Reginald Casilang, DNP, PMHNP-BC, FNP-BC — Psychiatric-Mental Health Nurse Practitioner. This article is educational and not a substitute for an individual evaluation. Never start, stop, or change a medication without speaking to your prescriber. If you are in crisis, call or text 988, or call 911.