MEDVi vs Lilly Direct vs PlexusDx (2026): Cost, Source & Best Fit | PlexusDx

Last reviewed: May 12, 2026 Last updated: May 12, 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.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on GLP-1 therapies, weight management protocols, and the genetic variables that shape every metabolic decision. Browse all Peptides & GLP-1 education

If you're cross-shopping MEDVi and Lilly Direct for tirzepatide-based weight loss, you're really comparing two different access models — and PlexusDx sits as a third option that solves a different problem altogether. MEDVi is an all-inclusive compounded-medication telehealth platform: doctor, prescription, compounded tirzepatide or semaglutide, and shipping in one monthly bill. Lilly Direct is Eli Lilly's own pharmacy storefront for FDA-approved Zepbound at self-pay vial pricing — medication only, no clinician included. PlexusDx Tirzepatide Injection, Semaglutide Injection, and Microdose GLP-1 Protocol are compounded protocols paired with the optional Precision Peptide Genetic Test, so titration starts from the patient's own GLP-1, GIPR, FTO, and MC4R variants rather than a population average. This article walks the actual 12-month math, the FDA-approved-vs-compounded distinction, the refill-window mechanics that change Lilly Direct's effective price, and where PlexusDx fits if neither all-inclusive compounded nor brand-name pharmacy-only is the right shape for your situation.

MEDVi vs Lilly Direct vs PlexusDx — quick decision frame

Three different access models cover the cash-pay GLP-1 market in 2026. MEDVi bundles a licensed clinician visit, compounded semaglutide or tirzepatide, supplies, and shipping into one flat monthly price — roughly $279 in month one for tirzepatide injection and $249-$369/mo at maintenance doses. Lilly Direct sells FDA-approved Zepbound vials at $299 (2.5 mg) and $449/month (7.5 mg and above) under the Self Pay Journey Program, but you must bring your own prescription and refill within 45 days or the price jumps to $599–$1,049 for that fill. PlexusDx Weight Management Protocols use compounded semaglutide and tirzepatide from licensed U.S. compounding pharmacies: Microdose GLP-1 Protocol at $129/mo flat, Semaglutide Injection at $149/mo, Tirzepatide Injection at $249/mo, and GLP-Squared dual-compound at $249/mo — with the option to anchor dosing to the Precision Peptide Genetic Test ($298 standalone or $99 as an add-on after your first month). All three models are cash-pay; PlexusDx adds no membership fee, operates in all 50 states (five require a live consult), and pairs every protocol with async clinician oversight.

The real 12-month cost: MEDVi vs Lilly Direct vs PlexusDx

For a cash-pay tirzepatide patient with no insurance coverage for weight-loss drugs, the annualized math splits cleanly. MEDVi's all-inclusive tirzepatide injection plan runs roughly $279 in month one and $249-$369/mo at maintenance, producing a 12-month total in the $4,670–$5,770 range with the doctor visit and shipping baked in. Lilly Direct's Self Pay Journey Program at $449/month (7.5 mg+) totals $5,388 across 12 perfectly on-time refills — before you add the cost of the prescription itself, which Lilly Direct does not include. Miss even one 45-day refill window and the price for that fill jumps to $599–$1,049 depending on dose. PlexusDx Tirzepatide Injection at $249/mo lands at $2,748–$3,708/year all-in — clinician, compounded medication, and shipping included. Semaglutide Injection ($149/mo) at $2,148–$2,748/year and the Microdose GLP-1 Protocol ($129/mo flat) at $1,548/year sit further below both MEDVi and Lilly Direct on a price-only basis. Add the Precision Peptide Genetic Test as a $99 add-on after month one and the genetics-included totals stay below MEDVi at every tier and below Lilly Direct's perfect-refill scenario at most tiers.

FDA-approved Zepbound vs compounded tirzepatide — what each platform dispenses

This is the substantive medication difference and it's worth understanding before you sign up for any of the three. Lilly Direct dispenses FDA-approved Zepbound — the same finished tirzepatide product that ran the SURMOUNT trials, manufactured by Eli Lilly under the FDA's regulatory framework for finished drug products. The full FDA-approved label, post-market surveillance, and prescribing information apply directly. MEDVi dispenses compounded tirzepatide and compounded semaglutide prepared by a U.S. state-licensed, FDA-regulated pharmacy — reportedly Belmar Pharmacy as a 503B outsourcing facility per third-party reporting. PlexusDx uses compounded semaglutide and tirzepatide from licensed U.S. compounding pharmacies as well, but spans four delivery formats — weekly injection, daily oral, microdose troche/lozenge/sublingual/capsule, and dual-compound stacks. Compounded semaglutide and tirzepatide are not FDA-approved finished drug products; they are pharmacy-prepared versions of the same active ingredients found in Wegovy, Ozempic, Mounjaro, and Zepbound. The compounded-vs-branded choice is not about active-ingredient effectiveness — it's about FDA approval status of the finished product, supply consistency, and which regulatory framework governs your medication. The FDA resolved the national tirzepatide shortage in October 2024, which narrowed the legal basis for widespread tirzepatide compounding; review your state's current rules and your prescribing clinician's pharmacy choice with care.

The 45-day refill rule and what it actually means for cost

Lilly Direct's $449/month maintenance pricing for Zepbound 7.5 mg and above is conditional on refilling within 45 days of your previous shipment. Miss the window — for a vacation, a missed reminder, a temporary side-effect pause — and the price for that single refill rises to $599 (7.5 mg), $699 (10 mg), $849 (12.5 mg), or $1,049 (15 mg). You can re-qualify for the $449 price on the next on-time order, but the missed-window fill counts. Across a year of normal life, even one or two missed windows can add hundreds to your real cost. MEDVi's flat all-inclusive pricing has no equivalent penalty: you pay the same monthly rate regardless of refill cadence. PlexusDx Tirzepatide Injection and Semaglutide Injection are also flat-monthly with no refill-window pricing tier. If your life schedule is predictable enough to never miss a 45-day window, Lilly Direct's $449 is a real number; if it isn't, your effective annual price is meaningfully higher than the headline.

What's included in the price — clinician, supplies, oversight

The bundle differs in ways that matter at first-month sign-up. MEDVi's flat monthly fee covers the clinician visit, compounded medication, syringes and supplies, shipping, and 24/7 messaging support. Lilly Direct sells medication only — you bring your own prescription from your PCP or a separate telehealth service, and any clinician fee is paid separately on top of the $299–$1,049 vial price. PlexusDx Weight Management Protocols are also all-inclusive: async provider consultation (or scheduled live consult in the five states that require it), the prescription, the compounded medication, and shipping are bundled in the protocol price. Across all three platforms the FDA-labeled side-effect profile of GLP-1 therapy applies — nausea, vomiting, diarrhea, constipation, abdominal pain, and headache are common; pancreatitis, gallbladder disease, and acute kidney injury are less common but documented; the boxed warning for thyroid C-cell tumors applies to both semaglutide and tirzepatide based on rodent studies. Patients with a personal or family history of medullary thyroid carcinoma or MEN2 should not use these medications and should discuss any GLP-1 decision with a licensed clinician.

Why genetics matter before you choose between Zepbound and compounded tirzepatide

GLP-1 response varies meaningfully across patients regardless of whether the molecule is FDA-approved branded or compounded. Variants in GLP1R (the GLP-1 receptor itself), GIPR (the GIP receptor that tirzepatide uniquely engages), FTO (appetite regulation), MC4R (satiety signaling), and TCF7L2 (insulin response) are associated with differential response patterns to semaglutide and tirzepatide. The Precision Peptide Genetic Test maps 48 genes and 57 variants across 14 health pathways — including 34 weight-management insights and the GIPR rs1800437 variant linked to differential tirzepatide response — so the prescribing clinician knows whether a faster titration, a slower one, a tirzepatide-first approach, or a microdose entry is more likely to fit your biology before week one. Neither MEDVi nor Lilly Direct performs this step — both default to a population-average titration schedule and adjust based on subjective tolerability over the first 8–12 weeks. PlexusDx anchors that same conversation to a measurable genetic baseline, available standalone for $298 or as a $99 add-on after your first month on any protocol.

Which one fits — a four-question frame

Question 1: Do you have commercial insurance that covers Zepbound at a low copay? If yes, neither Lilly Direct's self-pay vial nor any compounded route will beat that on price — use insurance through a covered pharmacy. Question 2: Are you cash-pay and is FDA-approved branded medication a hard requirement? Lilly Direct is the only option in this comparison that dispenses Zepbound directly; budget for $449/month plus a separate clinician fee, and hold the 45-day refill cadence. Question 3: Are you cash-pay, fine with compounded medication, and price-focused at maintenance dose? Compare MEDVi's $249-$369/mo all-inclusive to PlexusDx Tirzepatide Injection at $249/mo, Semaglutide Injection at $149/mo, and Microdose GLP-1 Protocol at $129/mo flat. Question 4: Do you want a genetic baseline informing dose and titration before the first injection? PlexusDx is the only option in this comparison that includes the Precision Peptide Genetic Test as part of the protocol pathway, with the $99 first-month add-on bringing total spend below MEDVi at every tier.

Frequently asked questions

Is compounded tirzepatide the same as Zepbound?

No. Both contain tirzepatide as the active ingredient, but Zepbound is an FDA-approved finished drug product manufactured by Eli Lilly. Compounded tirzepatide is prepared by U.S. state-licensed compounding pharmacies and has not been evaluated by the FDA for safety, effectiveness, or quality as a finished drug product. PlexusDx Weight Management Protocols use compounded tirzepatide; Lilly Direct dispenses FDA-approved Zepbound.

Is MEDVi cheaper than Lilly Direct at maintenance dose?

It depends on whether you hold the 45-day refill cadence. Lilly Direct at $449/month for 7.5 mg and above totals $5,388 across 12 perfectly on-time refills before clinician fees. MEDVi's all-inclusive plan at $249-$369/mo totals roughly $4,788–$5,988 with clinician included. PlexusDx Tirzepatide Injection at $249/mo totals $2,748–$3,708/year all-in — lower than both at every tier.

Does Lilly Direct include the doctor visit in the price?

No. Lilly Direct is a pharmacy platform — you must bring a valid prescription from your own healthcare provider or a separate telehealth service. The cost of obtaining that prescription is on top of the $299–$1,049 vial price. MEDVi and PlexusDx both include the clinician visit in the protocol price.

What is Lilly Direct's 45-day refill rule?

For Zepbound doses of 7.5 mg and above, you must refill within 45 days of your previous delivery to keep the $449/month Self Pay Journey Program price. Miss the window and that single refill is $599 (7.5 mg), $699 (10 mg), $849 (12.5 mg), or $1,049 (15 mg). You can re-qualify for the $449 price with your next on-time order.

Can I use HSA or FSA dollars with these platforms?

MEDVi accepts HSA and FSA payments. Lilly Direct self-pay purchases may also be eligible, but verify with your specific plan administrator. PlexusDx Weight Management Protocols are also generally HSA/FSA eligible as licensed-provider-prescribed treatments — confirm with your plan before enrolling.

Does PlexusDx offer a genetic test alongside the GLP-1 protocol?

Yes. The Precision Peptide Genetic Test maps 48 genes and 57 variants across 14 health pathways, including 34 weight-management insights and the GIPR rs1800437 variant tied to differential tirzepatide response. It is $298 standalone or $99 as an add-on after your first month on any PlexusDx Weight Management Protocol. Neither MEDVi nor Lilly Direct includes this kind of genetic baseline.

Which option is the most regulated path to tirzepatide?

Lilly Direct, because it dispenses FDA-approved Zepbound manufactured by Eli Lilly under the FDA's finished-drug regulatory framework. MEDVi and PlexusDx both use compounded tirzepatide from U.S. state-licensed compounding pharmacies, which operate under a different regulatory framework. If FDA approval of the finished product is non-negotiable for you, Lilly Direct is the right fit.

Related reading on PlexusDx

Related reading on PlexusDx: Tirzepatide Costs, Zepbound Cost, Compounded Tirzepatide, GLP-1 Cost.

Disclaimer: This article is educational and is not medical advice. PlexusDx offers semaglutide and tirzepatide through its Weight Management Protocols. Pricing for MEDVi and Lilly Direct is based on each provider's published rates as of April 2026; actual costs may vary by state, plan, and individual eligibility. PlexusDx does not sell, prescribe, or recommend any therapeutic peptide outside the GLP-1 category covered by its protocols. Discuss any GLP-1 medication decision with a licensed clinician.

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.