Starting Mounjaro
Your guide to 2.5mg — the first 4 weeks
The 2.5mg dose is your introduction to tirzepatide. This starting phase typically lasts 4 weeks and is designed to help your body adjust before escalating. Most patients experience mild side effects that subside within the first two weeks.
What to expect
Nausea and reduced appetite are common in the first 1–2 weeks. Eating smaller meals and staying hydrated helps. Most side effects are temporary as your body adjusts to the medication.
Getting your prescription
All pharmacies listed require a valid prescription. Most offer online consultations — some include this free of charge. Your prescriber will confirm 2.5mg is the right starting dose for you.
Saving on your first order
Several pharmacies offer first-order discounts and discount codes. Check for codes like FIRST20 or SAVE10 below. Some also waive the consultation fee on your initial order.
Quick tips
- Inject on the same day each week for consistency
- Store your pen in the fridge (2–8°C) until use
- Rotate injection sites: abdomen, thigh, or upper arm
- Don't skip the 2.5mg phase — it reduces side effects later
Best prices for this stage
Sorted by total cost including consultation fees.
Oxford Online Pharmacy
Best price
UK Meds
Cured Pharmacy
Chemist4U
Ashcroft Pharmacy
Pharmica
Boots Online Doctor
WePrescribe
heySlim
IQ Doctor
Bolt Pharmacy
HealthExpress
LloydsPharmacy Online Doctor
The Independent Pharmacy
PPRX Online Pharmacy
Medicspot
Numan
Pharmacy Planet
All pharmacies GPhC registered