Getting Ozempic or Mounjaro in Peru, Safely

Patients ask me some version of this question every week: can I get Ozempic here, and how do I know it's real?

Both halves deserve a straight answer. Yes, semaglutide and tirzepatide are available in Peru through licensed pharmacies. And yes, counterfeit pens circulate in the region — which makes the second half of the question the more important one.

Why the counterfeit problem is different with these drugs

With most counterfeit medication, the failure mode is that it does nothing. You take a fake antibiotic, it does not work, and you get worse in a way that eventually becomes obvious.

GLP-1 pens are different in two ways. First, you are injecting the contents directly, weekly, so whatever is in the pen goes straight into you. Second — and this is the part that catches people out — a counterfeit pen containing some active ingredient can produce real appetite suppression and real weight loss. It feels like it is working. That feeling is not evidence of anything, because you have no idea what dose you received or what else came with it.

Reports of fake semaglutide pens have surfaced across Latin America, and the WHO has issued global alerts on falsified semaglutide. This is not a hypothetical concern raised to push you toward a consultation.

Four rules that will keep you out of trouble

1. Buy from a licensed pharmacy, against a prescription. This is the single filter that removes most of the risk. A seller who does not ask for a prescription is telling you something important about their supply chain — believe them.

2. Check the product is DIGEMID-registered. DIGEMID is Peru's medicines regulator, part of the Ministry of Health. Registered products are verifiable through its public registry. If the box has no Peruvian registration marking, do not buy it.

3. Refuse compounded or repackaged vials. Legitimate semaglutide and tirzepatide come in sealed, manufacturer-filled pens. Anything decanted into a vial, sold as "the same molecule, cheaper", or presented as a compounded preparation is outside the regulated supply chain entirely. The saving is not worth what you are accepting in exchange.

4. Be sceptical of Instagram, WhatsApp groups and gyms. This is where most of the counterfeit product in Lima actually moves. The prices are better because the product is not what it claims to be.

What a legitimate prescription involves

If you have been prescribed a GLP-1 without any of the following, the prescription was not a proper one — regardless of who wrote it.

An assessment of whether you are a candidate. These medicines are indicated at a BMI of 30 or above, or 27 or above with a weight-related condition such as type 2 diabetes, prediabetes, hypertension, dyslipidaemia, sleep apnoea, fatty liver or PCOS. They are not appropriate for cosmetic weight loss at a normal BMI.

A check for contraindications. Pregnancy and breastfeeding. A personal or family history of medullary thyroid carcinoma, or multiple endocrine neoplasia type 2. Active pancreatitis. These are not paperwork — they are the reasons the medicine is prescription-only.

Baseline laboratory work. HbA1c, lipids, kidney, liver and thyroid function. Not because the drug is dangerous, but because you cannot tell what it has done for you without knowing where you started.

A dose escalation schedule. GLP-1s start low and increase gradually, over months. The schedule exists to keep side effects tolerable. Skipping ahead is the single most common reason patients abandon treatment in the first eight weeks.

A plan for muscle mass. Weight lost rapidly without adequate protein and resistance training includes lean tissue you will miss later. This is a real and well-documented issue with these medicines, and it is entirely manageable — but only if someone raises it before it happens.

An exit plan. What happens when you stop, how the taper works, and what maintains the result. If nobody has discussed this with you, you have been sold a prescription rather than given a treatment.

If you already started on your own

A fair number of people do, and I would rather see them than not. Bring the pen and the box, and tell me the dose you are on. We confirm the product is legitimate, run the baseline labs that should have been done at the start, and put the escalation and follow-up on a proper footing from wherever you currently are.

There is no lecture in this. Starting without supervision is a completely understandable response to a system that made supervision hard to get. The point of the appointment is what happens next.

The side effects that matter

Most are gastrointestinal, dose-related, and improve: nausea, constipation, reflux, and a fullness that arrives faster than you expect. Uncomfortable, mostly temporary, and largely managed by escalating slowly rather than heroically.

The ones to take seriously: persistent severe abdominal pain radiating to the back (possible pancreatitis), right-upper-abdominal pain with nausea (gallbladder), and vomiting persistent enough to cause dehydration. You should know what to do about each of these before you need to, which is a further argument for having a doctor involved from the beginning.

Where to start

If you want a sense of whether you are a candidate before booking anything, the GLP-1 candidacy check runs through the standard criteria in a couple of minutes. It is a screening tool and not a prescription, but it will tell you whether this is a conversation worth having.

If you would rather just discuss it, that is what the consultation is for — including the realistic monthly cost, which is a legitimate part of deciding whether this treatment fits your life.