PlexusDx vs Rex MD: GLP-1 Pricing, Products and Plan Terms Compared

Last reviewed: September 10, 2026 Last updated: September 10, 2026

Written by: Jay Hastings, CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

PlexusDx publishes this comparison and is one of the providers discussed. We use the same evidence rules for our own program and competing programs.

The short answer

PlexusDx compounded semaglutide injection runs $189 per month month-to-month (captured September 10, 2026; plexusdx.com, checkout-verified). Rex MD lists FDA-approved brand Wegovy injection pen at $499 per month and Wegovy oral pill at $349 per month—both described as starting rates with no separate membership fee documented (captured September 4, 2026; rexmd.com, from public pages; live page timed out, not checkout-verified). Over 12 months the injection comparison is $2,268 PlexusDx versus $5,988 Rex MD, a $3,720 difference; the oral comparison is $3,468 PlexusDx versus $4,188 Rex MD, a $720 difference (our calculations). The price gap reflects medication type: Rex MD provides FDA-approved brand Wegovy, while PlexusDx provides compounded semaglutide. Compounded medications are not FDA-approved; FDA does not review compounded drugs before marketing for safety, effectiveness, or quality. A licensed clinician determines whether a prescription is appropriate for an individual patient. PlexusDx works with licensed 503A compounding pharmacies. Neither provider offers tirzepatide; Rex MD carries only semaglutide (Wegovy brand), while PlexusDx also offers compounded tirzepatide injection and oral formulations. Rex MD states cost is "locked across titration doses," yet also labels its figures "starting price; exact dose/path eligibility varies," creating some uncertainty we cannot resolve from public pages alone. If brand Wegovy and the assurance of FDA approval matter most to you, Rex MD's oral pill option offers brand access at a moderate premium over compounded alternatives. If lowest monthly cost is the priority and you are comfortable with compounded medication, PlexusDx injection delivers the steepest discount. We lay out the plan terms, 12-month math, and decision factors below so you can weigh medication type, cost, and coverage for your situation.

At-a-glance comparison

Sources and capture dates: PlexusDx pricing verified September 10, 2026 at plexusdx.com (checkout flow). Rex MD pricing captured September 4, 2026 from rexmd.com public pages; cloud-browser page timed out during live checkout attempt, so figures are from first-party indexed pages only and have not been account- or payment-verified. Rex MD labels both rates "starting price; exact dose/path eligibility varies."

Like-for-like pricing: semaglutide injection, 12 months

Both providers offer semaglutide injection on month-to-month billing with no membership fee. The medication type differs—PlexusDx provides compounded semaglutide, Rex MD provides FDA-approved brand Wegovy pen—and that distinction drives most of the price difference.

Difference: PlexusDx month-to-month injection is $3,720 less over 12 months than Rex MD's Wegovy pen (our calculation: $189 × 12 = $2,268 versus $499 × 12 = $5,988). PlexusDx 6-month commitment brings the 12-month total to $1,788 (our calculation: $149 × 12), a $4,200 saving versus Rex MD.

What the numbers reflect: Rex MD's $499 figure is for FDA-approved brand Wegovy delivered in a pen injector, with cost stated as "locked across titration doses" and "$499/month medication cash price regardless of dosage strength for eligible self-pay patients" (rexmd.com, September 4, 2026). PlexusDx provides compounded semaglutide injection at a flat $189 month-to-month, same price at every dose. The page labels Rex MD's rate "starting price; exact dose/path eligibility varies," so confirm at account creation whether any additional fee or eligibility restriction applies. Because Rex MD's live checkout timed out during our verification attempt, we cannot rule out a service fee or checkout variance; the $499 and $349 figures come from public marketing pages only.

Like-for-like pricing: semaglutide oral, 12 months

Rex MD offers FDA-approved Wegovy oral pill starting at $349 per month. PlexusDx compounded semaglutide oral capsule is $289 per month month-to-month.

Difference: PlexusDx month-to-month oral is $720 less over 12 months than Rex MD's Wegovy pill (our calculation: $289 × 12 = $3,468 versus $349 × 12 = $4,188). The 6-month commitment brings PlexusDx to $2,988 for the year (our calculation: $249 × 12), a $1,200 saving versus Rex MD.

Oral-route context: Both options deliver semaglutide by mouth. Rex MD's pill is FDA-approved brand Wegovy; PlexusDx provides compounded oral capsules. The $60-per-month difference ($720 annually) is narrower than the injection gap, making the oral route the least expensive entry point to brand Wegovy among Rex MD's offerings and still less expensive with PlexusDx compounded. If you prefer to avoid injections entirely and want brand medication, Rex MD's oral pill is the most cost-accessible brand option in this comparison. If compounded oral is acceptable and budget is tightest, PlexusDx oral delivers another step down.

Decision factors beyond the monthly rate

Medication type and FDA status

Rex MD provides FDA-approved brand Wegovy in both pen-injector and oral-pill forms. Wegovy has completed Phase III trials, received pre-market FDA review for safety and effectiveness, and carries the regulatory standing of a branded pharmaceutical. PlexusDx provides compounded semaglutide and compounded tirzepatide, prepared by licensed 503A compounding pharmacies. Compounded medications are not FDA-approved. FDA does not review compounded drugs before marketing for safety, effectiveness, or quality. A licensed clinician determines whether a prescription is appropriate for an individual patient. If FDA approval is a threshold requirement—for your own confidence, for insurance documentation, or for peace of mind—Rex MD is the only option in this comparison that meets it. If you are comfortable with compounded medication under clinician oversight and prioritize cost, PlexusDx offers the same active pharmaceutical ingredient at a lower monthly rate.

Route and formulation variety

Rex MD offers semaglutide only, available in injection pen and oral pill. PlexusDx offers both semaglutide and tirzepatide, each available in injection and oral forms, plus a microdose semaglutide injection maintenance protocol at $129 per month. If you want tirzepatide—which has shown higher average weight reduction in head-to-head trials versus semaglutide—Rex MD does not carry it. If you want to start on a microdose for side-effect management or maintenance after initial results, PlexusDx is the only provider in this pair with a published microdose option.

Commitment term and price predictability

Both providers bill monthly. PlexusDx offers optional 3-month or 6-month prepaid commitments that lower the per-month rate ($169 and $149 for semaglutide injection, respectively); you may cancel future shipments but prepaid months are non-refundable. Rex MD states "lowest cost locked across titration doses per page" (rexmd.com, September 4, 2026), suggesting the advertised rate holds regardless of dose escalation. However, the same page labels the figures "starting price; exact dose/path eligibility varies," and we could not verify checkout flow or account terms because the live page timed out. If dose-locked pricing matters—particularly during titration, when some providers raise rates at higher doses—confirm that guarantee in writing during Rex MD account setup. PlexusDx publishes "same price at every dose" on every product page (plexusdx.com, September 10, 2026).

Evidence strength and checkout transparency

PlexusDx pricing was verified through live checkout September 10, 2026. Rex MD pricing was captured from public marketing pages September 4, 2026; the live site timed out before we could complete account creation or reach a payment screen, so the $349 and $499 figures have not been confirmed at checkout and no account dashboard or billing detail is available to verify inclusions. The data is first-party (rexmd.com), but it is not interaction-verified. This is a limitation, not a disqualification—many readers will find the public-page data sufficient for initial comparison—but if you need certainty about the final monthly charge, fees, or subscription terms, create an account and review the checkout summary before committing.

Review and service-quality record

PlexusDx holds a 4.3-star rating on Trustpilot, with 79% of reviews at five stars and 83% at four stars or higher (captured September 9, 2026; trustpilot.com/review/plexusdx.com). We searched Trustpilot and Reddit for Rex MD review volume and themes during the September 4, 2026 research pass; indexed results returned search links but no rating, review count, or negative-theme summary was captured, so we cannot report verified service-quality data for Rex MD. This does not imply absence of reviews—only that our evidence-collection method did not yield a scorable dataset. If customer-support responsiveness, shipping consistency, or clinician-interaction quality weigh heavily in your decision, search "Rex MD" on Trustpilot and Reddit yourself and read recent reports before committing, then compare that record against PlexusDx's published 4.3-star profile.

Choose Rex MD if…

• You want FDA-approved brand Wegovy and are willing to pay a premium for that regulatory status and the brand name's clinical trial record.
• The oral pill route appeals to you and you prefer brand medication; at $349/month Rex MD's Wegovy pill is the least expensive brand option in this comparison and still injectable-free.
• You do not need tirzepatide and semaglutide alone meets your clinical goals.
• You value "locked across titration" pricing assurance (confirm that guarantee at account setup) and are comfortable verifying final terms yourself at checkout since we could not complete live verification.

Choose PlexusDx if…

• Lowest monthly cost is the priority and you are comfortable with compounded semaglutide or tirzepatide under licensed clinician oversight.
• You want the option to choose tirzepatide—which has demonstrated higher average weight reduction than semaglutide in comparative trials—or to switch between compounds without changing providers.
• Oral and injection routes both interest you, and you want the flexibility to compare them within one program; PlexusDx offers semaglutide and tirzepatide in both forms.
• You are considering a microdose maintenance protocol after reaching your goal weight; PlexusDx publishes a $129/month microdose semaglutide injection option, while Rex MD does not document a microdose tier.
• You prefer checkout-verified, interaction-tested pricing and plan terms with a documented Trustpilot service record (4.3 stars, 83% four-star or higher).
• You want the option to prepay 3 or 6 months and lock a lower per-month rate (PlexusDx semaglutide injection drops to $149/month on 6-month commitment, $1,788 annually—a $4,200 annual saving versus Rex MD's $5,988 brand pen cost).

Methodology and freshness

PlexusDx pricing, inclusions, and commitment terms were verified September 10, 2026 by completing the intake form, adding a product to cart, and reviewing the checkout summary at plexusdx.com. No payment was submitted, but all pre-purchase details—monthly rate, what is included, subscription terms, and dose-pricing policy—were captured from live account and cart interfaces. Rex MD pricing and plan details were captured September 4, 2026 from first-party public pages at rexmd.com. We attempted live checkout verification using a cloud-browser session; the page timed out before account creation or payment screen could be reached, so Rex MD figures are from indexed marketing pages only and have not been confirmed at checkout. No account dashboard or order-confirmation screen is available for Rex MD, and no review rating or volume was captured during the indexed research pass. All 12-month cost totals are our calculations (monthly rate × 12). Prepaid per-month equivalents (PlexusDx 3-month and 6-month rates) are labeled as prepaid and represent the effective monthly cost when that commitment is chosen; they are our calculation of the per-month rate, though the commitment itself is a published option. We do not publish promotional codes, discount arithmetic, or unpublished pricing. Every price figure in this article carries its capture date and source; where evidence could not be checkout-verified, we state that limitation plainly. If you find a price, term, or inclusion that differs from what we report here, note the date you captured it and whether it was from a public page or a logged-in checkout screen, then decide accordingly. This article reflects evidence available as of September 10, 2026. Pharmacy partnerships, formularies, and rates may change; check both providers' sites and your cart total before committing.

Frequently Asked Questions

Is Rex MD's Wegovy the same medication as PlexusDx compounded semaglutide?

Both contain semaglutide as the active pharmaceutical ingredient, but they are not the same product. Rex MD provides FDA-approved brand Wegovy, which has completed Phase III trials and received pre-market FDA review for safety, effectiveness, and quality. PlexusDx provides compounded semaglutide prepared by licensed 503A compounding pharmacies. Compounded medications are not FDA-approved; FDA does not review compounded drugs before marketing. A licensed clinician determines appropriateness for each patient.

Why is Rex MD so much more expensive for injection?

Rex MD's $499 per month injection price buys FDA-approved brand Wegovy in a pen injector, which carries the cost of brand-name pharmaceutical development, FDA approval process, and branded manufacturing. PlexusDx's $189 per month injection is compounded semaglutide, which does not carry those brand costs. The $310 per month difference ($3,720 annually) primarily reflects brand versus compounded status. If brand status and FDA approval are priorities, the premium may be justified; if cost is the priority and compounded is acceptable, PlexusDx delivers the same active ingredient at a lower rate.

Does PlexusDx offer tirzepatide, and does Rex MD?

PlexusDx offers compounded tirzepatide in both injection ($289/month month-to-month, $269/month 3-month, $249/month 6-month) and oral capsule ($349/month month-to-month, $299/month 3-month, $279/month 6-month). Rex MD does not offer tirzepatide in any form; the program carries only semaglutide as Wegovy brand. If you want tirzepatide or want the option to switch between semaglutide and tirzepatide without changing providers, PlexusDx is the only choice in this comparison.

Can I switch from Rex MD brand Wegovy to PlexusDx compounded semaglutide, or vice versa?

Switching providers and medication sources is possible, but you will need a new prescription from the receiving provider's clinician, and the transition timing depends on your current dose, shipment schedule, and the new provider's intake and fulfillment process. Neither provider guarantees a specific transition timeline or dose-matching at transfer. If you are considering a switch, complete intake with the new provider, discuss your current dose and goals with their clinician, and plan enough overlap or buffer supply to avoid a gap. Do not assume automatic continuity across programs.

Which provider is better if I want oral semaglutide and lowest cost?

PlexusDx compounded semaglutide oral capsule is $289 per month month-to-month ($3,468 annually) and $249 per month on 6-month commitment ($2,988 annually). Rex MD brand Wegovy oral pill is $349 per month ($4,188 annually, starting rate from public page). PlexusDx is $60 to $100 per month less expensive depending on commitment term. However, PlexusDx oral is compounded (not FDA-approved), while Rex MD is brand Wegovy (FDA-approved). If you want oral route and brand status, Rex MD is the only option. If you want oral route and lowest cost and are comfortable with compounded, PlexusDx is less expensive. Both deliver semaglutide by mouth, avoiding injections entirely.

Sources

• PlexusDx product pages and checkout flow (plexusdx.com; accessed September 10, 2026)
• Rex MD public marketing pages for Wegovy oral pill and Wegovy injection pen programs (rexmd.com; accessed September 4, 2026; cloud-browser live page timed out, data from indexed first-party pages)
• PlexusDx Trustpilot profile (trustpilot.com/review/plexusdx.com; accessed September 9, 2026)
• Rex MD Trustpilot and Reddit search (accessed September 4, 2026; no rating or review volume captured in indexed pass)

Compounded medication disclosure: Compounded medications are not FDA-approved. FDA does not review compounded drugs before marketing for safety, effectiveness, or quality. PlexusDx works with licensed 503A compounding pharmacies. A licensed clinician determines whether a prescription is appropriate for an individual patient.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.