Difference Between ADR and ADE (With Table)

ADR, also known as adverse drug reactions, is defined as any reprisal to a harmful, poisonous, and unplanned drug that happens at doses and is employed to diagnose or treat disease in humans, excluding failure to accomplish the desired outcome result. ADR is a conventional drug in both its conceptual and practical use.

The adverse drug event (ADE), also known as the adverse drug reaction, is a drug reaction that occurs due to the usage of a medication. There is a distinction between adverse effects induced by medicine and harmful reactions resulting from the drug’s use. No evidence of a causal link between the treatment and the occurrence has been discovered.


The main difference between ADR and ADE is that ADE includes all medical errors (such as drug name confusion, misadministration, and miscalculations), on the other hand, ADR does not contain any medical errors.

An adverse drug stage is defined as “an injury that occurs due to the use of a medication.” This definition encompasses damage produced by the drug (negative drug responses and overdoses) and the harm resulting from the use of the drug (adverse drug reactions and overdoses). Although prescription mistakes may result in Adverse Drug Events, most of them do not.

As defined by the FDA, an adverse drug reaction is a toxic and unexpected response to medicine that occurs when the drug is administered to a person at dosages that would ordinarily be used in the treatment of illness, prevention of disease, diagnostic of the disease, or therapy of disease, or for the change of a physiologic function.

Comparison Table Between ADR and ADE

Parameters of ComparisonADRADE
ConceptToxic and detrimental changes are suspected to be caused by a medicine typically used in humans, which occurs at therapeutic levels.Any medical incident was not anticipated but occurred while a patient was treated with a pharmaceutical substance.
Causal RelationshipAn association between the substance and the occurrence is thought to be causative.There is no requirement for a Causal Relationship.
What it depictsShows allergic reactions as well as adverse effects.This illustration depicts the harm produced by a substance and the harm caused by its use.
Medical ErrorsMedical errors are not included in the definition of medical malpractice.The term “medical errors” is used to describe these mistakes.
Common ExampleThe medication causes an allergic reaction to a medicine.Aspiration pneumonia following excessive sedation as a result of a morphine overdose.

What is ADR?

As defined by the drugmaker in the instruction description, an adverse drug response (ADR) is a reaction that occurs when a particular drug is taken. In addition to being more harmful than side effects, ADR increases the likelihood of a patient being admitted to a hospital. It appears that there is a causal relationship between the medication and the adverse event. The Adverse Drug Reaction has a lower consistency than side effects compared to the latter. As a result of the use of the medication, a contusion has developed.

Rashes, jaundice, anaemia, a reduction in the WBC count, kidney problems, and nerve damage that may impair sight or hearing are all examples of adverse medication responses that might occur. These responses are usually more significant and only happen in a tiny percentage of persons, but they are still possible.

What is ADE?

It is an injury due to medical intervention in connection with a substance. When an ADE appears, it does not usually imply any illusion or care and protection of a lower quality than usual. Instead, ADE is a treatable condition that occurs due to a pharmaceutical error that leads the patient to be overextended and suffers severe consequences.

It is estimated that approximately 50 per cent of all ADEs are preventable on a conservative basis. In this case, there is no evidence of a causal relationship between a drug and an adverse occurrence. In all positions of supervision and protection, ADE is one of the most common and intense events that might occur. ADE can be prevented in all situations.

Main Differences Between ADR and ADE

  1. As opposed to adverse drug reaction, which is defined as an event that occurs when a link between a controlled drug and a response can be established, an adverse drug event is defined as an event that occurs when no connection can be found between a regulated medication and occurrence of a reaction.
  2. Medical errors such as miscalculations, medication name confusion, and mis-administration, among other things, are included in ADE, although they are not included in ADR (adverse drug reactions).
  3. When opposed to ADE, ADR has a shorter duration of action.
  4. ADE differs from ADR in that the harm must be directly caused to the person, but ADR does not require that the damage be now driven to the person.
  5. In contrast to ADR, which covers allergies and other minor side effects, ADE depicts harm caused by a drug and hazardous products associated with its use.
  6. When compared to ADE, ADR has a higher risk of exposure because ADR has a more significant number of potentially harmful outcomes.
  7. ADR is always associated with the administered medical product. Still, ADE is not necessarily associated with the administered medicinal product (or may not be associated with the distributed medicinal product).


In layman’s terms, an adverse drug reaction (ADR) is an injury that occurs due to taking medication. Adverse drug reactions (ADRs) can arise due to two or more medications. An adverse drug reaction (ADE) is an injury that occurs when a drug is taken, and ADR is the only type of reaction with an adverse reaction to the medicine.

The Food and Drug Administration of the United States defined intense adverse drug reactions as those in which the patient’s outcome is one of the following: death, hospitalization, life-threatening, congenital anomaly, and so on.

Acute drug-induced psychosis (ADE) might be local, meaning it is isolated to a specific place or systemic. The medication has generated mad effects throughout the entire structured communication system. There are 150 Adverse Drug Reactions Monitoring Centers (AMCs) in India, spread around the country.


  1. https://link.springer.com/article/10.1007/s00228-016-2081-6
  2. https://agsjournals.onlinelibrary.wiley.com/doi/abs/10.1111/jgs.15419