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TL;DRA contraindication, in German Kontraindikation or Gegenanzeige, is a documented reason that a medicine, procedure, or treatment must not be used in a particular situation because it would be harmful. It is a hard rule rather than a suggestion: where a contraindication applies, the expected harm outweighs any benefit, and the therapy is ruled out.
Contraindications are the counterpart to indications. An indication states when a medicine should be used; a contraindication states when it must not. For a prescriber or pharmacist they are among the first facts to check, because giving a medicine to a patient it is contraindicated in is one of the clearest and most avoidable medication errors. A contraindication is also legally load-bearing: it marks a limit of the marketing authorisation, so using a medicine against its stated contraindication moves the therapy outside the approved use.
The standard medical distinction is between two strengths of prohibition.
| Absolute contraindication | Relative contraindication | |
|---|---|---|
| Meaning | The medicine or procedure must be avoided entirely; there is no reasonable circumstance in which it should be used. | The medicine may be used with caution, only when the expected benefit outweighs the risk. |
| Typical reason | A life-threatening reaction is documented, for example a severe allergy to the active substance. | An increased but manageable risk that requires closer monitoring or a dose adjustment. |
| Consequence | Do not use. | Weigh, monitor, and decide case by case. |
The line between the two is not always fixed: a relative contraindication can become absolute in a particular patient, which is exactly why contraindications have to be assessed against the individual rather than read from a list. In the SmPC the wording of section 4.3 is deliberately strict: it names situations where the medicine must not be used at all, and anything that is merely a caution belongs in section 4.4 instead.
Contraindications have a fixed home in a medicine's approved information. In the Summary of Product Characteristics (SmPC), the German Fachinformation, section 4.3 "Contraindications" (Gegenanzeigen) is a mandatory section, fixed by Article 11 of Directive 2001/83/EC and mirrored in § 11a AMG. Its content is prescribed: it lists the situations in which the medicine must not be given. Common triggers recorded in section 4.3 include the following.
A contraindication can also be specific to a strength, a route, or a formulation, so the same active substance may be contraindicated in one product and permitted in another. Because these entries are coded from the Fachinformation into structured data, they can be matched automatically against a patient.
Section 4.3 is not the only place a risk is recorded, and confusing it with the neighbouring section leads to over- or under-reacting. A contraindication (section 4.3) is an absolute bar: do not use. A special warning or precaution for use, in SmPC section 4.4 (Warnhinweis), is a caution: the medicine may be used, but with a stated safeguard such as monitoring, a dose change, or careful patient selection.
| Contraindication (SmPC 4.3) | Warning / precaution (SmPC 4.4) | |
|---|---|---|
| Nature | An absolute bar to use in the stated situation. | A caution, not a bar; use is allowed with a safeguard. |
| Typical action | Do not dispense or prescribe for this patient. | Monitor, adjust the dose, or select patients carefully. |
A contraindication is a fact in a document; on its own it does nothing at the counter. C.A.V.E. is the mechanism that surfaces the relevant contraindications for one particular patient. The contraindication is the data, coded from the Fachinformation; C.A.V.E. is the check that matches that data to the patient in front of you, screening the medicine against their diseases, allergies, age, kidney function, and similar attributes, so a relevant Gegenanzeige is flagged before dispensing rather than recalled from memory. Contraindications are one of the risk types C.A.V.E. exists to catch, and it runs next to the interaction check as "CAVE / Interaktionen".
On pharmazie.com contraindications reach professionals as coded data behind the C.A.V.E. risk check in the licensed ABDA-Datenbank.
One honest limitation: C.A.V.E. surfaces documented contraindications from the coded product information, and it is only as complete as the patient data entered. Whether a relative contraindication rules a therapy out in a given case is a clinical judgement. It is decision support for professionals, not a therapy decision.
