The 15mg pen is the highest available Mounjaro dose. Clinical trials showed an average 20.9% body weight loss at this level. Not everyone needs to reach 15mg — your prescriber will determine the optimal dose for you.

The average price for Mounjaro 15mg across 71 UK pharmacies is £306.84. Simple Online Pharmacy charges £323.99, which is 6% above the market average.

Simple Online Pharmacy discount codes

£40 offNew customers

£40 Off 1st Orders

FIRST40

View all discount codes →

Frequently asked questions

How much does Mounjaro 15mg cost at Simple Online Pharmacy?

Mounjaro 15mg at Simple Online Pharmacy costs £323.99 per 4-week supply as of March 2026.

Is Simple Online Pharmacy the cheapest for Mounjaro 15mg?

Simple Online Pharmacy is ranked #58 out of 71 pharmacies for Mounjaro 15mg. The cheapest is £204.99 at Pharmacy Planet.

Does Simple Online Pharmacy include consultation and delivery for Mounjaro 15mg?

Simple Online Pharmacy does not include a consultation fee and does not include delivery in the £323.99 price.

Is Simple Online Pharmacy GPhC registered?

Yes, Simple Online Pharmacy is registered with the General Pharmaceutical Council (GPhC number: 9011287). You can verify this on the GPhC register.

Related comparisons

Compare all pharmacies for 15mg →Simple Online Pharmacy — all doses →Compare all Mounjaro prices →All discount codes →

Prices updated March 2026. Always confirm with the pharmacy before ordering.