Weight-Loss Medicines: The Questions I Ask at the Counter

Reviewed August 7, 2026 by Sara, licensed pharmacist. This article is general education, not personal medical advice.

Editorial correction: the orlistat section now distinguishes Alli contraindications from interactions requiring medical advice. Pen instructions, European product information and Italy’s rules on online medicine sales have also been clarified.

Weight-loss medicines have changed the conversation at the pharmacy counter more than anything else in the last few years. People arrive with a prescription and no explanation of it, or with a screenshot of a website, or with a box of capsules bought abroad.

So rather than another article about obesity as a concept, this is the practical version: what I actually ask, what I check, and where I would stop someone.

Before the medicine: what the number does and does not tell you

BMI is a screening tool for populations. It does not distinguish muscle from fat, it says nothing about where fat is stored, and the thresholds behave differently across ethnic groups — which is why it is a starting point and not a diagnosis.

What adds real information: waist circumference (abdominal fat carries more metabolic risk than the same weight elsewhere), blood pressure, blood glucose and HbA1c, lipids, liver markers, sleep quality and daytime sleepiness, joint pain, and the medicines someone is already taking — several of which cause weight gain themselves, including some antipsychotics, antidepressants, corticosteroids and older antihistamines.

And the part people expect least from a pharmacy: the goal is rarely a number. Improvements in blood pressure, glucose, mobility, sleep apnoea and joint pain arrive well before any target weight does, and they are the reasons treatment is worth having.

Sara explaining how weight fits into a wider health picture — The measurement that changes management is usually not the one on the scale.

GLP-1 medicines: what I check

Semaglutide, liraglutide and tirzepatide (the last acting on both GIP and GLP-1 receptors) act on appetite signalling and can slow gastric emptying. Their injectable formulations are prescription-only medicines in Italy, with a daily or weekly schedule and dose increases that depend on the product. The pharmacy should check the exact brand, authorised indication and current Italian reimbursement rules rather than treating every prescription as interchangeable.

When someone collects one, these are the questions that matter:

“What else are you taking?” If there is another diabetes medicine in the picture — a sulfonylurea, or insulin — the risk of hypoglycaemia changes and the prescriber may need to adjust it. Slowed stomach emptying can also affect the timing of other oral medicines. Anyone on diuretics or blood-pressure medicines should know that dehydration from vomiting or diarrhoea is a real risk rather than an inconvenience.

“Has anyone shown you how to use this exact pen?” Bring the device and its instructions to the pharmacy. Single-use and multidose pens work differently: whether a needle must be attached or changed, whether a flow check or priming step is needed, and when to discard the device are product-specific. Ask for a demonstration of the prescribed device, including injection sites and rotation, storage before and after first use, and sharps disposal. Do not transfer the steps from a different pen or an online demonstration of another product.

“What are you doing about the nausea?” Nausea, vomiting, diarrhoea and constipation are common side effects and can make treatment difficult to continue. Smaller portions, eating slowly and avoiding large, fatty meals may help. Persistent vomiting needs medical advice: dehydration can affect kidney function, and the prescriber may need to reconsider the dose increase. Do not keep escalating a dose while unable to keep fluids down without contacting the prescriber.

“Have you been told what to watch for?” Severe, persistent abdominal pain, especially if it radiates to the back, needs urgent assessment because pancreatitis is one possible cause. Discuss pregnancy plans before treatment: these medicines should not be used in pregnancy, and the time needed between stopping treatment and trying to conceive depends on the product.

“Has the prescriber checked your medical and family history?” Mention thyroid disease, medullary thyroid carcinoma and MEN2 before starting. Contraindications must be checked against the current European product information for the medicine prescribed. For example, the EU Wegovy information lists hypersensitivity in section 4.3; it does not list MTC or MEN2 there. That is not a reason to dismiss the history or decide suitability yourself — it is a reason to use the correct product information and discuss it with the prescriber.

“And what happens after?” Weight regain after stopping is well documented. Whether it is a course or a long-term treatment is a decision to have with the prescriber at the start, not a surprise a year in.

The part I feel strongest about: where the pen came from

In 2023 falsified semaglutide pens were found in the legal supply chain in several European countries, and both the EMA and national agencies issued alerts. Falsified devices have been found containing insulin instead of semaglutide — which, injected by someone who does not have diabetes, is dangerous.

Demand has outstripped supply repeatedly, and websites appeared to fill the gap. An offer to sell a prescription injection without a prescription is a warning sign. In Italy, the rule goes further: online sales of prescription medicines to the public are not permitted, even if a prescription is supplied. A low price or a familiar-looking package does not establish that a pen is genuine.

In Italy, the EU common logo links to the Ministry of Health register of sellers authorised to sell non-prescription medicines online. Click it and check that the registered website matches the one you are using. The logo does not authorise the online sale of a prescription GLP-1 medicine. Ask a pharmacy how to obtain the prescribed product through the appropriate supply route.

The over-the-counter shelf

Orlistat reduces absorption of some dietary fat. The non-prescription product Alli 60 mg has its own eligibility criteria and contraindications: its EU indication is for adults with a BMI of at least 28, alongside a mildly reduced-calorie, lower-fat diet. The pharmacy should check the actual product and its current availability in Italy.

The medicine check changes whether it can be used. Alli must not be taken with ciclosporin, warfarin or other oral anticoagulants. These are contraindications, not combinations made acceptable by taking the tablets a few hours apart. Levothyroxine is a different situation: a doctor should be consulted before starting Alli, because thyroid control may be affected and dosing at different times or dose adjustment may be needed. Do not change either prescription yourself.

A high-fat meal can make orlistat’s gastrointestinal effects more troublesome, and it can reduce absorption of fat-soluble vitamins. Pregnancy, breastfeeding, chronic malabsorption and cholestasis are also reasons not to use Alli. Its leaflet and a pharmacist’s check matter even though it can be supplied without a prescription.

“Fat burners”, detox teas and metabolism boosters are food supplements. The claims are generally not supported, but the real concern is different: analyses of products in this category have repeatedly found undeclared pharmaceutical substances, including sibutramine, which was withdrawn from the European market for cardiovascular risk. A supplement bought from a social-media seller has no meaningful oversight.

Sara discussing weight management care options — Prescription medicine, OTC option, or supplement — three completely different levels of oversight.

What to bring to the first appointment

If you are going to talk to a doctor about this, the appointment goes better with:

A full list of medicines and supplements, including the ones bought abroad or online.
The conditions that change the plan: diabetes, hypertension, sleep apnoea, PCOS, thyroid disease, depression, joint problems, pregnancy plans.
What you have already tried, and what specifically made you stop — cost, side effects, time, or it simply not working. That last one is the most useful sentence in the appointment and the one people most often leave out.
What you actually want: better blood pressure, less knee pain, more energy, off a medicine. A goal that is not a number is easier to succeed at.

Obesity care is medical care, and it is worth asking for properly. What I would not do is take a route around the prescription, because that is the one part of the process with no safety net at all.

Frequently asked questions

Can I buy weight-loss injections without a prescription in Italy?

No. These injections require a prescription, and Italy does not permit online sales of prescription medicines to the public, even with a prescription. The EU common logo identifies authorised sellers of non-prescription medicines; it does not authorise an online sale of a GLP-1 injection.

Why does the pharmacy ask what else I take?

Because the interactions that matter are not obvious. Other diabetes medicines change hypoglycaemia risk, delayed stomach emptying can affect the timing of other oral medicines, and dehydration from vomiting or diarrhoea matters if you take diuretics or blood-pressure medicines.

Do fat-burner supplements work?

Products sold as fat burners are food supplements, not medicines, and the evidence behind the claims is generally weak. The bigger concern is what has been found in some of them: undeclared pharmaceutical substances, including ones withdrawn from the market.

Is BMI a good measure?

It is a population screening tool, not a diagnosis. It does not distinguish muscle from fat or say where fat is stored, which is why waist measurement, bloods and history add more than the number alone.