✓ Written by Derek Giordano, Founder & Editor · Last reviewed October 8, 2026 · Medical disclaimer

Multi-Medication Injection Schedule Calculator

Some people manage more than one injectable at a time. This calculator adds up a schedule you already have: weekly amounts per medication, total injections per week, and how many vials each needs over four weeks. It does not suggest combinations or doses, and combining unapproved compounds is not something we recommend.

Enter at least one prescribed medication

How the totals are calculated

For each medication, weekly amount = dose × times per week. Vials per four weeks = (weekly amount × 4) ÷ (vial mg × 1,000), rounded up. Total injections per week is the sum of each medication's frequency, which helps when planning injection sites and supplies.

A worked example

Two prescribed medications: one at 250 mcg twice a week from a 5 mg vial, the other at 1,000 mcg once a week from a 10 mg vial. The first uses 500 mcg a week and needs 1 vial per four weeks (2 mg of 5 mg). The second uses 1,000 mcg a week, also 1 vial per four weeks (4 mg of 10 mg). That is three injections a week. Illustrative numbers only.

Combining medications safely

What changed on this page

This page previously offered preset "stacks" with doses and cycle lengths for unapproved peptides. We removed them because those protocols are not based on human trials. The calculator now adds up schedules that come from a prescriber.

Frequently asked questions

Does this calculator recommend peptide stacks?
No. It adds up doses you enter. It does not suggest combinations, and there is no human trial evidence supporting combinations of unapproved peptides.
Why count injections per week?
Each injection needs a site, a syringe and a sharps disposal. Knowing the weekly count helps with supplies and site rotation.
Can I put two medications in one syringe?
Only if a pharmacist confirms they are compatible. Many are not.

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