Renal dosing for psychiatric medications
Which psychiatric meds to avoid, dose-adjust, or feel safe with by eGFR band. Lithium first, then everything else.
The eGFR band framework
Most psychiatric prescribing decisions in renal disease sit inside five bands. The cutoffs aren't sacred, but they're what package inserts and KDIGO use, so it's worth speaking the same language as your nephrology colleagues.
| eGFR (mL/min/1.73 m²) | Stage | What changes for psychiatry |
|---|---|---|
| Above 90 | Normal or CKD 1 | Usually nothing, though watch for proteinuria if lithium is on board. |
| 60 to 89 | CKD 2 (mild) | Lithium starts to need closer monitoring. Most other meds unchanged. |
| 30 to 59 | CKD 3 (moderate) | Lithium often needs dose reduction. Gabapentin, pregabalin, paliperidone, duloxetine all shift. |
| 15 to 29 | CKD 4 (severe) | Lithium is usually stopped or handled by nephrology. Duloxetine off the table. Big cuts to gabapentin/pregabalin. |
| Below 15 or dialysis | ESRD | Renal handling drops out. Dialyzable drugs (lithium, gabapentin, pregabalin) become dose-after-dialysis conversations. |
The main renal-adjusted psychiatric drugs
| Drug | Renal handling | eGFR 30 to 59 | eGFR 15 to 29 | ESRD or dialysis | Notes |
|---|---|---|---|---|---|
| Lithium | ~95% renal, unchanged | Reduce dose, target lower level (often 0.4 to 0.6 mEq/L), monitor closely | Avoid if possible; if unavoidable, co-manage with nephrology | Dialyzable; some patients dosed only after HD sessions | Interactions with NSAIDs, ACEi, ARBs, thiazides matter more than the eGFR number itself |
| Gabapentin | 100% renal | 400 to 1400 mg/day divided | 200 to 700 mg/day | 100 to 300 mg after each HD session | Sedation, myoclonus, and encephalopathy climb fast when this gets missed |
| Pregabalin | 90% renal | 75 to 300 mg/day | 25 to 150 mg/day | 25 to 75 mg once daily plus supplemental dose after HD | Same failure mode as gabapentin, and the toxicity is more obvious |
| Paliperidone (oral) | 59% renal, unchanged | Max 6 mg/day if CrCl 50 to 80; max 3 mg/day if CrCl 10 to 49 | Max 3 mg/day | Not recommended | The long-acting injectables (Invega Sustenna, Trinza, Hafyera) aren't recommended if CrCl below 50 |
| Duloxetine | Renal excretion of metabolites | Use with caution, no fixed adjustment | Avoid | Avoid | The label says don't use if CrCl below 30. Concentrations climb, and there's no clean rescue |
| Venlafaxine | 87% renal | Reduce dose 25 to 50% | Reduce dose 50% | Reduce 50%, dose after HD | Blood pressure creeps up regardless of renal function; watch it |
| Desvenlafaxine | Predominantly renal | 50 mg daily (skip every other day if CrCl 30 to 50) | 50 mg every other day | 50 mg every other day, after HD | Cleaner PK than venlafaxine but still needs adjustment |
| Memantine | 57 to 82% renal | Standard dose fine | 5 mg twice daily (max) | Not well studied; use lowest dose | Watch for confusion in the moderate band, not just severe |
| Amantadine | 90% renal | Reduce dose (100 mg daily typical) | 100 mg every 2 to 3 days | 200 mg every 7 days | Underappreciated cause of delirium in older patients with quiet CKD |
| Viloxazine | 50% renal metabolites | No adjustment needed if CrCl above 30 | Not studied, use caution | Avoid | Newer ADHD agent, limited real-world CKD data |
| Atomoxetine | Hepatic, not renal | No renal adjustment | No renal adjustment | No renal adjustment | Reduce for hepatic impairment (Child-Pugh B: 50%; Child-Pugh C: 25%) |
| Topiramate | 70% renal | Reduce dose 50% | Reduce dose 50% | Dose after HD; supplemental dose often needed | Metabolic acidosis and kidney stones become more likely, not less, in CKD |
| Lamotrigine | Renal, as glucuronide | Reduce maintenance dose | Reduce maintenance dose further | Titrate slowly, monitor | Package insert is vague; go slow and let clinical response guide you |
Lithium in more detail
Lithium is where most clinicians get burned. A few practical points that matter more than the eGFR band alone.
Hydration and interactions drive toxicity, not baseline creatinine. A stable patient at eGFR 55 on lithium for 20 years can be fine. Add an NSAID for back pain, a thiazide for hypertension, or a stomach bug that leaves them dehydrated, and the level triples in a week. The eGFR is a snapshot. What actually causes toxicity is anything that reduces effective circulating volume or blocks tubular handling.
The interactions that matter most:
- NSAIDs. Ibuprofen, naproxen, celecoxib all raise lithium levels 15 to 30% or more. Sulindac and aspirin are the least problematic. If a patient on lithium is taking OTC ibuprofen daily, that's a conversation, not a shrug.
- Thiazides. Hydrochlorothiazide can raise lithium levels 25 to 40%. Loop diuretics are less predictable but still risky.
- ACE inhibitors and ARBs. Effect is real but modest, more in older adults and those with baseline CKD.
- Dehydration. GI illness, hot weather, low sodium intake. Any of these can push a stable level into toxic range.
Chronic lithium and CKD. Long-term lithium use (10+ years) is associated with slowly declining GFR in a subset of patients. It's not universal, and the risk is smaller than early observational data suggested, but it's real. If eGFR is dropping by more than 3 to 4 mL/min per year on chronic lithium, that's worth a nephrology conversation.
Dosing in CKD stage 3. Most patients tolerate a 25 to 50% dose reduction with a target trough level around 0.4 to 0.6 mEq/L. Check levels more often (every 3 months rather than every 6). If they're symptomatically well, don't chase a higher level.
The five renal traps in psychiatric prescribing
Missing paliperidone's renal ceiling. Providers often switch from risperidone to paliperidone assuming the pharmacokinetics are equivalent. They aren't. Risperidone is metabolized to 9-hydroxyrisperidone (which is paliperidone) hepatically, so it has some renal-tolerant handling. Paliperidone starts as the active metabolite and gets cleared by the kidney. Below CrCl 50, the LAI formulations aren't recommended at all.
Duloxetine below CrCl 30. The label is clear, but plenty of patients on chronic duloxetine develop CKD without anyone noticing. When eGFR drifts under 30, taper it and switch. Sertraline or mirtazapine are usually cleaner picks.
Gabapentin encephalopathy in dialysis patients. Someone on 900 mg TID before starting HD who doesn't get dose-adjusted will look demented within days. Myoclonus, sedation, confusion. It's fully reversible if you catch it. Post-dialysis dosing (100 to 300 mg after each session) is the fix.
Amantadine in older adults. Prescribed for parkinsonism, dyskinesia, or sometimes off-label for fatigue in MS. Older patients often have eGFR below 60 that hasn't been flagged, and the drug accumulates. Delirium follows. It's on the Beers list for a reason.
Lithium during acute illness. The most common way stable patients end up on the toxicology service is a viral gastroenteritis or a UTI treated at urgent care. Educating patients to hold lithium for 24 to 48 hours during significant vomiting/diarrhea and to hydrate is one of the highest-yield conversations you'll have.
SSRIs, SNRIs, and other antidepressants that don't need much adjustment
This is the easier list. Most SSRIs are hepatically metabolized and don't accumulate much in CKD, though bupropion and its metabolites deserve a small note.
| Drug | Renal adjustment needed? | Notes |
|---|---|---|
| Sertraline | No | Workhorse choice in CKD and dialysis. Well tolerated. |
| Escitalopram | No formal adjustment; consider lower dose in severe CKD | QT prolongation risk climbs with electrolyte shifts in ESRD |
| Citalopram | Same as escitalopram | Same QT considerations |
| Fluoxetine | No | Long half-life is actually helpful in dialysis where levels swing |
| Fluvoxamine | No | CYP interactions are the bigger issue |
| Mirtazapine | Modest reduction if CrCl below 40 | Clearance drops ~30% but usually well tolerated at standard doses |
| Bupropion | Reduce dose or frequency if eGFR below 50 | Metabolites (hydroxybupropion) accumulate; seizure threshold matters |
| Vortioxetine | No adjustment | Limited data in severe CKD |
| Vilazodone | No adjustment needed | Little dialysis data |
| Trazodone | No formal adjustment | Watch for orthostasis, which is worse in dialysis patients |
Contrast, procedures, and holding meds
The main psychiatric drug that comes up before contrast studies is lithium. There's no consistent recommendation to hold it, though some centers hold it for 24 to 48 hours before contrast in patients with reduced eGFR to avoid stacking a nephrotoxic risk on unstable renal handling. Metformin gets more attention here, but if a patient is on both, it's worth thinking about.
For elective surgery, most psychiatric medications can continue. The exceptions worth flagging to anesthesia:
- MAOIs. Historically held for 2 weeks pre-op due to meperidine and sympathomimetic interactions. Practice varies now.
- Lithium. Sometimes held 24 to 72 hours pre-op due to fluid shifts and NMBA interactions. Cardiac and neuro cases especially.
- Clozapine. Not a renal issue, though worth mentioning; NPO status and volume shifts can affect metabolism and drop clearance.
Common questions
How do I dose lithium in CKD stage 3?
Start by asking why they're on it and whether they're stable. If they're doing well at eGFR 45 on 900 mg total daily dose with a level of 0.7, don't make changes reflexively. If they're new to lithium at eGFR 45, start lower (300 to 600 mg total daily), target 0.4 to 0.6 mEq/L, check levels every 5 to 7 days until stable, then every 3 months. Educate on holding for GI illness and avoiding NSAIDs. If eGFR drops below 45 on chronic lithium, involve nephrology.
Can I use gabapentin in ESRD?
Yes, but the dose changes dramatically. Typical regimen is 100 to 300 mg after each hemodialysis session, no daily dose in between. If someone comes in on 900 mg TID and starts dialysis without adjustment, they'll be confused, myoclonic, and possibly obtunded within a few days. It's fully reversible with dose correction.
Do I need to hold anything before contrast?
Not usually, from a psychiatric med standpoint. Lithium is sometimes held for 24 to 48 hours in patients with reduced eGFR getting iodinated contrast, though the evidence is thin. Metformin is the bigger concern. Coordinate with the ordering team if the patient's eGFR is below 45 and they're on lithium.
What SSRIs are safest in dialysis?
Sertraline is the default and has the most data. Citalopram and escitalopram are fine, though watch QT in patients with electrolyte shifts around HD. Fluoxetine works. Paroxetine is generally avoided for other reasons (anticholinergic, discontinuation), not renal. Bupropion needs dose adjustment. Duloxetine and venlafaxine are the antidepressants to reconsider in advanced CKD.
Why does paliperidone need renal adjustment when risperidone doesn't?
Risperidone is metabolized in the liver to 9-hydroxyrisperidone, which is paliperidone. So both drugs end up producing paliperidone, and it's the kidney that clears it. Risperidone gets more hepatic first-pass and has some redundancy in handling, while paliperidone (given as the active metabolite directly) depends almost entirely on renal clearance. That's why the paliperidone label caps the dose in CKD and the LAI formulations are contraindicated below CrCl 50.
Sources
- FDA labels via DailyMed for lithium, paliperidone, duloxetine, venlafaxine, desvenlafaxine, gabapentin, pregabalin, memantine, amantadine.
- KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD.
- Package inserts for Invega Sustenna, Trinza, and Hafyera (paliperidone palmitate LAIs).
- Stahl's Essential Psychopharmacology, 5th edition.
- UpToDate: "Drug dosing in chronic kidney disease" and topic-specific reviews.
- Micromedex renal dosing tables (institutional access).
- Cochrane and observational data on chronic lithium and CKD progression.
Reviewed against current guidelines as of June 8, 2026. This is not medical advice.
THE KNOWLEDGE PATH
Walk this topic outward.
- GUIDE Renal dosing for psychiatric medications (current)
- CLASS SSRIs
- MEDICATION Sertraline (Zoloft)
- CONDITION Major Depressive Disorder (on Shrinkopedia)
- CARE Depression care at shrinkMD
The Knowledge Path is a curated walk. Every step is one decision away from the next.
Managing a medication needs a prescriber
Any psychiatric medication has to be started and adjusted by a clinician who can follow you over time. If you don't have a prescriber, our guides section explains the options, including in-person care and telepsychiatry, and how to choose between them.