Garrett Halweg MD – Honolulu, Hawaii Ketamine Clinics

✓ Last verified: February 8, 2026 — Edited & verified by Angelica Bottaro for HealingMaps Editorial Staff

Known For: Dr. Garrett Halweg is a Honolulu-based psychiatrist who completed his residency at the University of Hawaii/Queens Medical Center in 2003. His personal experience surviving multi-system organ failure in 2013 shaped his approach to optimizing both physical and mental health. The practice offers ketamine infusion therapy alongside TMS for treatment-resistant mood disorders, providing a comprehensive brain health approach rare among Hawaii providers.

HealingMaps Take: Dr. Halweg brings a unique personal perspective to brain health, having survived a life-threatening illness that reshaped his clinical philosophy. His combination of ketamine infusions and TMS therapy gives Honolulu patients access to two of the most promising treatments for resistant mood disorders in a single practice. Wait times for appointments can be longer due to limited availability, so prospective patients should plan ahead. One of the few Hawaii providers accepting HMSA insurance for psychiatric services.

Market Position: Garrett Halweg MD is an IV-ketamine-focused clinic in the Honolulu metro — the most common cash-pay protocol in the HealingMaps verified directory.

Garrett Halweg MD Ketamine Cost Calculator

Ketamine Protocols Compared — What’s Offered at Garrett Halweg MD

Industry pricing reference. Garrett Halweg MD has not published specific per-session pricing — contact the clinic directly for a quote. The calculator above shows typical metro-level cost estimates across protocols, not this clinic’s specific prices.

What to Expect at Your First Garrett Halweg MD Appointment

1. Initial intake call — Brief medical history review, depression and anxiety screening, and medical clearance for IV ketamine. Call (808) 202-0669 to schedule.
2. Medical evaluation — in-person or telehealth psychiatric assessment, vitals check, and review of current medications with the Garrett Halweg MD clinical team.
3. First treatment session — supervised IV ketamine infusion in a private treatment room, lasting approximately 60–90 minutes (40-minute infusion + recovery). Sessions are held at 1188 Bishop St., Suite 2008, Honolulu, HI 96813. You’ll have a comfortable chair or recliner, dim lighting, and direct medical monitoring throughout.
4. Recovery and follow-up — observation period after dosing, mood check-in with the clinical team, and scheduling your next session. Arrange for a ride home; do not drive for 24 hours after your IV session.

What to Ask on Your Garrett Halweg MD Consult Call

• How long has the Garrett Halweg MD clinical team been delivering ketamine therapy, and what specialty training do your providers hold?
• Does Garrett Halweg MD provide a superbill for out-of-network insurance reimbursement, and what’s a typical 6-session total cost including any follow-up?
• Does Garrett Halweg MD require a referral from a current treating psychiatrist, and how do you handle outside-prescriber medication-management coordination?
• What does Garrett Halweg MD recommend for patients who don’t respond to the standard 6-session acute series?

Honolulu Ketamine Market Snapshot

Sources: CDC PLACES 2023 (Honolulu County, HI, crude prevalence) · U.S. Census ACS 5 Year · HealingMaps proprietary patient inquiry data.

• Adult depression in Honolulu County, HI: 15.1%
• Frequent mental distress (14+ days per month): 15.3%
• Adults lacking health insurance: 5.2%
• Honolulu County population: 1,010,100 · median household income $99,816
• Recent Honolulu-area inquiries to HealingMaps: A growing stream of Hawaii residents have recently contacted us seeking ketamine care

Behind this data: HealingMaps has analyzed 23,496 patient inquiries (Oct 2022 – Mar 2026), mapped 1,473 verified clinics across 3,142 counties, scraped 132 clinic pricing pages, and collected 658 practitioner survey responses. This snapshot reflects our multi-source methodology.

From the 2026 Ketamine Industry Report

44.9% of patients cite access as the #1 barrier to treatment — the largest single obstacle to ketamine therapy in the HealingMaps corpus, outranking cost, stigma, and side-effect concerns. Source: HealingMaps 2026 Ketamine Clinic Intelligence Report — drawn from 23,496 patient inquiries and 132 clinic website analyses.

Patient Questions about Garrett Halweg MD

This 2-question summary is matched to the protocols and conditions Garrett Halweg MD treats. Editorial responses are HealingMaps-authored, grounded in our 2026 Ketamine Clinic Intelligence Report.

Is Garrett Halweg MD suited for treatment-resistant depression?

Garrett Halweg MD treats depression via IV ketamine (off-label, evidence-based). Insurance coverage is rare for IV/KAP — most patients pay out of pocket. TRD is typically defined as two or more prior antidepressant trials without sufficient response — patients meeting that bar are best candidates here.

Can Garrett Halweg MD help with anxiety disorders?

Yes — Garrett Halweg MD treats anxiety, including generalized anxiety, social anxiety, and panic disorder. The evidence base for ketamine in anxiety is less robust than for depression, but it can be a meaningful option for patients who haven’t responded to SSRIs or benzodiazepines. Worth asking which of their protocols they typically recommend for anxiety-primary patients.

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