Almost any effective medicine can also produce unwanted effects. The good news is that most are mild and short-lived — but a minority can be serious, and recognizing them in time can save your health or even your life. This guide helps you tell an ordinary side effect from an adverse reaction that demands attention, recognize the warning signs, and know exactly how to report the problem to the Romanian regulatory authority.
What is an adverse drug reaction (ADR) and how it differs from a side effect
The World Health Organization defines an adverse drug reaction (ADR) as a response to a medicine that is harmful and unintended, occurring at doses normally used in humans (WHO). In short: the effect is not the one you want and it harms you.
In everyday speech we say “side effect,” but not all side effects are alike. Some are expected, known and listed in the package leaflet — for example drowsiness from an older-generation antihistamine or mild nausea in the first days of treatment. These are usually predictable, dose-dependent and resolve on their own. Others are unexpected, severe or new and that is exactly where the need to report arises.
Pharmacologists classically divide reactions into two types:
| Type | Characteristics | Example |
|---|---|---|
| Type A (“augmented”) | Predictable, dose-dependent, related to the drug’s action; usually less serious | Bleeding from an anticoagulant, hypoglycaemia from too high a dose of insulin |
| Type B (“bizarre”) | Unpredictable, not dose-dependent, often allergic or idiosyncratic; can be serious | Anaphylactic shock to penicillin, severe skin rash |
The practical rule: if the effect is new, intense, frightens you or occurs with a medicine under additional monitoring (see below), it is worth reporting — even if you are not 100% sure the medicine is the cause (BNF).
Warning signs — when to call 112 immediately
Some reactions are medical emergencies. Do not wait and do not “see how it is tomorrow” — call 112 if you experience:
- Anaphylaxis (severe allergic reaction): swelling of the lips, tongue, face or throat; a feeling of choking, wheezing; widespread hives; sudden dizziness or fainting. It often appears within minutes to hours of administration.
- Newly appeared difficulty breathing, tightness in the chest, or blue lips and fingers.
- Severe skin reactions: blisters, peeling skin, sores in the mouth, eyes or genital area, accompanied by fever. These may be signs of Stevens-Johnson syndrome, toxic epidermal necrolysis or DRESS — rare but life-threatening conditions.
- Signs of thrombosis: pain and swelling in a calf, sudden chest pain with shortness of breath (especially in people taking hormonal contraceptives).
- Bleeding that does not stop, tarry black stools, or vomiting blood.
Until help arrives: stop taking the suspected medicine (if possible), do not take a new dose, and keep the box and the leaflet — they will help both the doctors and the later report.
Common examples, by drug class
The table below shows reactions worth knowing before you start a treatment. The brand names are real examples from the Romanian market; other products with the same INN (international nonproprietary name — the active substance) may also exist.
| Class (INN) | Brand examples | Reaction to watch for |
|---|---|---|
| Beta-lactam antibiotics (amoxicillin ± clavulanic acid) | Augmentin, Amoksiklav | Rash, itching, up to anaphylaxis (penicillin allergy) |
| Statins (atorvastatin, rosuvastatin) | Sortis, Atoris, Crestor | Persistent muscle pain, dark-coloured urine |
| Combined contraceptives (ethinylestradiol + drospirenone) | Yasmin, Yaz | Pain or swelling in the calf, chest pain, shortness of breath (thrombosis) |
| Oral anticoagulants (acenocoumarol, apixaban) | Sintrom, Eliquis | Bleeding: gums, red urine, black stool |
| NSAIDs (ibuprofen, diclofenac) | Nurofen, Voltaren | Stomach pain, black stool (digestive bleeding) |
You can learn more about each group in our dedicated guides: antibiotics, statins, contraceptives and anticoagulants. And to recognize the signals on the box, see how to read the package leaflet correctly.
The pharmacovigilance system in Romania
Pharmacovigilance is, in the WHO definition, the science concerned with the detection, assessment, understanding and prevention of the adverse effects of medicines. In Romania, the responsible authority is the National Agency for Medicines and Medical Devices of Romania (ANMDMR — the Romanian medicines regulator). The legal framework is provided by Law no. 95/2006 on healthcare reform (Title XVIII — Medicinal Products), aligned with the European good pharmacovigilance practice regulations.
The data collected in Romania does not remain isolated: it reaches EudraVigilance, the European database managed by the European Medicines Agency (EMA), where it is analysed alongside reports from all member states. This is how safety signals are discovered that a single hospital or a single country would not notice.
The role of the pharmacist and the doctor. Health professionals have an obligation to report suspected adverse reactions. The pharmacist at your neighbourhood pharmacy — Catena, Dona, Help Net, Dr.Max, Farmacia Tei or any independent pharmacy — is often the first person you reach. They can assess your symptoms, direct you to a doctor or to the emergency room, and can fill in the reporting form on your behalf. Do not hesitate to ask for their help: it is part of their role.
How to report an adverse reaction (step by step)
In Romania you can also report as a patient or carer, not only through a doctor. The main instrument is the Suspected Adverse Reaction Reporting Form (informally called a “yellow card,” after the British “Yellow Card” model), available online on anm.ro / adr.anm.ro.
- Go to anm.ro (or to the adr.anm.ro portal), to the adverse reaction reporting section, and choose the form for patients.
- Describe what happened: what symptoms you had, when they appeared and how long they lasted.
- Note the suspected medicine — the brand name and, if you know it, the INN (active substance), the dose, the reason for taking it and the batch/lot number from the box.
- Add the relevant details: age, sex, other medicines taken in parallel, chronic illnesses, known allergies.
- Submit the form. You do not have to be sure that the medicine caused the reaction — mere suspicions are also reported.
Alternatively, you can report through your doctor or pharmacist, or through the marketing authorisation holder (the manufacturer), whose contact details are in the package leaflet. And if the reaction comes from a product bought from dubious sources, first check the authenticity of the medicine — a counterfeit product is itself a risk worth reporting.
The black triangle — medicines under additional monitoring
If you see in the leaflet a black triangle pointing downwards (▼) accompanied by the text “This medicine is subject to additional monitoring,” it means that the EMA is closely watching its safety — usually because it is relatively new on the market or because data is still limited. The symbol does not say that the medicine is dangerous; it is an explicit invitation for patients and professionals to report any suspected reaction, so that information can be gathered quickly (EMA). For these medicines, your threshold for reporting should be even lower.
Why your report matters
A single report may seem like a drop in the ocean, but this is exactly how medicine safety works: through the accumulation of many individual observations. The clinical trials conducted before approval include a few thousand patients and cannot capture rare reactions or those that appear after years of use. Real-life reports — including yours — have, over time, led to updates of package leaflets, the restriction of certain doses and, in serious cases, the withdrawal of products from the market.
When you report, you are not complaining in vain: you contribute to a database that protects children, the elderly, pregnant women and anyone who might take the same medicine after you. See also our guide on medicines during pregnancy and breastfeeding, categories where caution counts double.
Key takeaways
- An ADR means any harmful and unintended effect of a medicine; do not confuse an ordinary side effect with a serious reaction.
- Signs for calling 112: swelling of the face or throat, choking, severe rashes with blisters, bleeding that does not stop, signs of thrombosis.
- Report to ANMDMR via the Suspected Adverse Reaction Reporting Form (informally a “yellow card”) online — you can do so as a patient and for mere suspicions.
- The black triangle ▼ means additional monitoring: report all the more readily.
- For any uncertainty about a new symptom, ask your doctor or pharmacist first.