Last reviewed: September 17, 2026 Last updated: September 17, 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

GobyMeds structures tirzepatide two ways: $299 per month with monthly billing, or a three-month starter bundle at $399 upfront ($133 per month over the bundle window). For semaglutide, GobyMeds offers only prepaid three-month bundles ranging from $299 to $499 upfront ($99.67 to $166.33 per month over the bundle window), with no month-to-month option. Over 12 months, GobyMeds' prepaid tirzepatide starter bundle totals $1,596 if four consecutive bundles are allowed, compared to $3,588 on the monthly plan—a $1,992 difference. PlexusDx tirzepatide runs $3,468 per year on month-to-month billing or $2,988 on a six-month commitment. For semaglutide, GobyMeds' mid-tier bundle ($133/month over the bundle window) lands at $1,596 annually, while PlexusDx month-to-month semaglutide costs $2,268. The prepaid route saves money if you commit the cash upfront and your dose stays within the tier; the monthly route preserves flexibility and avoids upfront outlays.

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GobyMeds monthly vs prepaid: at-a-glance comparison

Medication & Plan GobyMeds Price Billing 12-Month Cost
Tirzepatide monthly $299/month Monthly $3,588
Tirzepatide starter bundle $399 upfront
($133/mo over bundle)
3-month prepaid $1,596
(four bundles, our calculation)
Semaglutide starter/low tier $299 upfront
($99.67/mo over bundle)
3-month prepaid $1,196
(four bundles, our calculation)
Semaglutide mid tier $399 upfront
($133/mo over bundle)
3-month prepaid $1,596
(four bundles, our calculation)
Semaglutide high tier $499 upfront
($166.33/mo over bundle)
3-month prepaid $1,996
(four bundles, our calculation)

GobyMeds prices verified September 4, 2026. All GobyMeds plans include consult, prescription, supplies, and overnight shipping. Compounded medications are not FDA-approved.

Normalized 12-month cost: monthly vs prepaid across both drugs

GobyMeds structures tirzepatide and semaglutide differently, so the monthly-versus-prepaid question has two answers.

Tirzepatide: $3,588 monthly vs $1,596 prepaid (if renewal allowed)

GobyMeds tirzepatide monthly billing runs $299 per month at any dose, totaling $3,588 over 12 months (our calculation). The three-month starter bundle costs $399 upfront—$133 per month over the bundle window. If GobyMeds allows patients to purchase four consecutive starter bundles across 12 months, the annual outlay would be $1,596 (our calculation), a saving of $1,992 compared to monthly billing. The evidence does not specify whether patients remain eligible for the starter tier indefinitely or must transition to a higher tier or monthly plan after the first bundle; confirm renewal policy at enrollment.

PlexusDx tirzepatide injection costs $289 per month on month-to-month billing ($3,468 per year, our calculation) or $249 per month on a six-month commitment ($2,988 per year, our calculation). PlexusDx charges the same price at every dose, eliminating tier-jump risk, and allows you to pause or cancel month-to-month without forfeiting prepaid funds. The six-month plan is billed as two three-month cycles at $747 each; if you pay both upfront, the effective rate is $249 per month over 12 months.

Provider & Plan Monthly Rate 12-Month Total Billing
GobyMeds tirzepatide monthly $299 $3,588 Monthly
GobyMeds tirzepatide starter bundle × 4 $133 over bundle $1,596
(our calculation)
Four 3-month prepaid bundles
PlexusDx tirzepatide injection MTM $289 $3,468
(our calculation)
Month-to-month
PlexusDx tirzepatide injection 6-month $249 $2,988
(our calculation)
Two 6-month cycles

Semaglutide: prepaid bundles only—no GobyMeds monthly option

GobyMeds does not offer a month-to-month semaglutide plan. Semaglutide is sold exclusively as three-month prepaid bundles, priced by dose tier: starter or low dose (0.2–0.4 mg) at $299 upfront ($99.67 per month over the bundle window), mid tier (up to 0.6–1.5 mg) at $399 upfront ($133 per month over the bundle window), and high tier (up to 1.9–2.3 mg) at $499 upfront ($166.33 per month over the bundle window). If a patient can purchase four consecutive mid-tier bundles over 12 months, the annual cost is $1,596 (our calculation). A dose increase that pushes you into the next tier raises your cost by $100 per three-month bundle.

PlexusDx semaglutide injection costs $189 per month on month-to-month billing ($2,268 per year, our calculation), $169 per month on a three-month commitment ($2,028 per year, our calculation), or $149 per month on a six-month commitment ($1,788 per year, our calculation). PlexusDx holds the same price at every dose—0.25 mg through 2.4 mg—so dose titration does not trigger a tier jump or surprise billing increase.

Provider & Plan Monthly Rate 12-Month Total Billing
GobyMeds semaglutide starter/low $99.67 over bundle $1,196
(four bundles, our calculation)
Four 3-month prepaid bundles
GobyMeds semaglutide mid tier $133 over bundle $1,596
(four bundles, our calculation)
Four 3-month prepaid bundles
GobyMeds semaglutide high tier $166.33 over bundle $1,996
(four bundles, our calculation)
Four 3-month prepaid bundles
PlexusDx semaglutide injection MTM $189 $2,268
(our calculation)
Month-to-month
PlexusDx semaglutide injection 3-month $169 $2,028
(our calculation)
Four 3-month cycles
PlexusDx semaglutide injection 6-month $149 $1,788
(our calculation)
Two 6-month cycles

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Strengths and gaps: what the billing models reveal

GobyMeds prepaid bundles deliver the lowest per-month rate—if your dose stays in tier

GobyMeds' three-month semaglutide bundles start at $99.67 per month over the bundle window (starter/low tier, $299 upfront) and its tirzepatide starter bundle lands at $133 per month over the bundle window ($399 upfront). Both figures represent the lowest advertised per-month rates in this comparison when averaged over the bundle window. The catch is liquidity: you pay the full three-month cost upfront, and if your clinician moves you to a higher dose tier mid-bundle, you may face a $100–$200 step-up at the next renewal. GobyMeds tiers semaglutide into four dose bands (starter, low 0.2–0.4 mg, mid up to 0.6–1.5 mg, high up to 1.9–2.3 mg), so a patient who titrates from 0.5 mg to 1.0 mg during the first three months will jump from the $299 bundle ($99.67/month over the bundle window) to the $399 bundle ($133/month over the bundle window) at renewal—a 33% increase in the monthly rate.

GobyMeds tirzepatide monthly plan ($299) offers dose flexibility without prepay

GobyMeds charges a flat $299 per month for tirzepatide at any dose when billed monthly. This structure eliminates tier-jump risk: whether your provider prescribes 2.5 mg, 7.5 mg, or 15 mg, the price remains $299. The trade-off is a higher monthly outlay compared to the starter bundle—$299 versus $133 per month over the bundle window—but you avoid committing $399 upfront and you can pause or cancel without forfeiting prepaid funds. Over 12 months the monthly plan totals $3,588, while four prepaid starter bundles (if renewal is allowed) total $1,596, a difference of $1,992.

PlexusDx month-to-month plans preserve flexibility and match every-dose pricing

PlexusDx semaglutide injection runs $189 per month and tirzepatide injection $289 per month on month-to-month billing, with the same price at every dose. You can pause, resume, or cancel at any billing cycle without losing prepaid funds or stepping into a higher tier. The month-to-month rate is higher than GobyMeds' prepaid rates but lower than GobyMeds' tirzepatide monthly plan ($299) for tirzepatide. PlexusDx also offers three-month and six-month commitment discounts: semaglutide drops to $169/month (three-month) or $149/month (six-month), and tirzepatide drops to $269/month (three-month) or $249/month (six-month). The six-month plans are billed as two three-month cycles, so the commitment is shorter than a single six-month prepay and you retain some mid-year flexibility.

Semaglutide: no monthly option at GobyMeds means prepaid-only comparison

GobyMeds does not offer month-to-month semaglutide billing. If you prefer to pay monthly rather than committing $299–$499 upfront every three months, the GobyMeds semaglutide structure does not accommodate that preference. PlexusDx month-to-month semaglutide at $189 becomes the only true monthly option in this comparison, and it costs more per month than GobyMeds' prepaid rates but preserves liquidity and pause rights.

Choose GobyMeds prepaid bundles if…

  • You have $299–$499 cash available every three months and prefer locking in the lowest per-month rate.
  • Your clinician expects your dose to remain within a single tier for multiple renewals (especially relevant for semaglutide, where tier jumps cost an extra $100–$200 per bundle).
  • You are starting tirzepatide and your provider agrees the starter dose range will cover your needs for at least one renewal cycle.
  • You do not anticipate needing to pause or cancel mid-bundle—GobyMeds' refund and cancellation policies for prepaid bundles should be confirmed at enrollment.

Choose GobyMeds tirzepatide monthly if…

  • You want tirzepatide without committing $399 upfront, and you value the ability to pause or cancel month-to-month.
  • Your provider expects dose adjustments across multiple tier bands, and you prefer a flat $299 rate at any dose over the risk of tier-jump billing.
  • You are comparing the GobyMeds monthly tirzepatide rate ($299) to other providers' month-to-month plans and find it competitive for your needs.

Choose PlexusDx if…

  • You want true month-to-month semaglutide billing ($189) with pause and cancel rights—GobyMeds does not offer a monthly semaglutide option.
  • You prefer the same price at every dose, eliminating tier-jump surprises as you titrate semaglutide from 0.25 mg to 2.4 mg or tirzepatide from 2.5 mg to 15 mg.
  • You value shorter commitment windows: PlexusDx six-month plans are billed as two three-month cycles ($447 for semaglutide, $747 for tirzepatide per cycle), giving you a mid-year decision point rather than a single six-month prepay.
  • You want tirzepatide month-to-month at $289—$10 less than GobyMeds' monthly tirzepatide rate—with the option to drop to $249/month on a six-month plan if you decide to commit later.
  • You reviewed PlexusDx's 4.3-star Trustpilot rating (79% five-star, 83% four stars or higher, captured September 9, 2026) and prefer a provider with established public review history.

Methodology and freshness

GobyMeds pricing, billing structure, and inclusions verified September 4, 2026, from public product pages and intake flows. PlexusDx pricing verified September 17, 2026, from live product pages. We calculated 12-month totals by multiplying published monthly rates by 12 (month-to-month plans) or by modeling four consecutive three-month bundles (GobyMeds prepaid) and two consecutive six-month cycles (PlexusDx six-month plans); these totals are labeled "our calculation" throughout. GobyMeds' per-month rates for prepaid bundles are derived by dividing the upfront cost by three and reflect the rate over the bundle window; these are labeled "over the bundle window" or "our calculation." We did not independently verify whether GobyMeds allows indefinite renewal of starter-tier bundles or requires transition to a different tier; confirm renewal eligibility at enrollment. PlexusDx review record (4.3 stars, 79% five-star) captured September 9, 2026, from trustpilot.com/review/plexusdx.com. No promotional codes, insurance billing, or brand-name drug prices are included. All prices reflect compounded medication programs; compounded drugs are not FDA-approved.

Frequently Asked Questions

Does GobyMeds offer a month-to-month semaglutide plan?

No. GobyMeds sells semaglutide only as three-month prepaid bundles, priced by dose tier from $299 to $499 upfront. If you prefer monthly billing for semaglutide, PlexusDx offers month-to-month at $189 per month with pause and cancel rights at any billing cycle.

How much do I save choosing GobyMeds prepaid over GobyMeds monthly for tirzepatide?

GobyMeds tirzepatide monthly costs $299 per month, totaling $3,588 over 12 months. The three-month starter bundle costs $399 upfront ($133/month over the bundle window); if you purchase four consecutive bundles across 12 months, the total is $1,596, saving $1,992. Confirm with GobyMeds whether starter-tier renewal is allowed indefinitely or whether you must switch tiers after the first bundle.

What happens if my semaglutide dose increases mid-bundle at GobyMeds?

GobyMeds tiers semaglutide bundles by dose range. If your provider increases your dose beyond your current tier's ceiling—for example, from 0.4 mg (low tier, $299) to 1.0 mg (mid tier, $399)—you will pay the higher bundle price at your next three-month renewal. Tier jumps add $100–$200 per bundle depending on the step.

How does PlexusDx six-month pricing work—do I pay $1,788 upfront for semaglutide?

No. PlexusDx bills its six-month plans as two consecutive three-month cycles. For semaglutide at $149/month on the six-month rate, you pay $447 every three months (two cycles total $894 over six months, or $1,788 over 12 months). You are not required to prepay the full 12 months upfront.

Which provider offers the lowest 12-month cost for tirzepatide?

GobyMeds' tirzepatide starter bundle, if you can renew it four times, totals $1,596 over 12 months—the lowest figure in this comparison. PlexusDx tirzepatide on a six-month plan totals $2,988 over 12 months. GobyMeds monthly tirzepatide totals $3,588. The GobyMeds prepaid rate requires $399 cash every three months and assumes starter-tier eligibility continues; confirm renewal rules before committing.

Sources

  • PlexusDx semaglutide and tirzepatide injection product pages, plexusdx.com, accessed September 17, 2026.
  • GobyMeds pricing and plan structure, gobymeds.com public pages and intake flow, verified September 4, 2026.
  • PlexusDx Trustpilot profile, trustpilot.com/review/plexusdx.com, accessed September 9, 2026.

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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.

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