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Types of Adverse Drug Reactions
Name : Ramesh Pothala
Qualification: MSc(O.C)
Student ID : 032/022023
5/5/2023
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@clinosolresearch
Index
Adverse drug reactions.
Types of adverse drug reactions.
Classification of adverse drug reactions based on
severity.
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Adverse Drug Reaction(ADR):
Any noxious change which is suspected to be due to a drug,
occurs at doses normally used in man ,requires treatment or
decrease in dose or indicates caution in future use of same
drug.
Therefore ,an adverse drug reaction is an adverse event with
a causal link to a drug.
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Types Of Adverse Drug Reactions
Type A (Augmented)
Type B (Bizarre)
Type C (Chemical)
Type D (Delayed)
Type E (Exit/End of treatment)
Type F (Familial)
Type G (Genotoxicity)
Type H (Hypersensitivity)
Type U (Un classified)
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Type A (Augmented) reactions
Reactions which can be predicted from the known pharmacology of the
drug.
Dose dependent,
Can be alleviated by a dose reduction.
E.g.
Anticoagulants – Bleeding,
Nitrates – Headache.
Type B (Bizarre) reactions
Cannot be predicted from the pharmacology of the drug
Not dose dependent,
Host dependent factors important in predisposition
E.g.
Penicillin – Anaphylaxis.
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Type C (Chemical)reactions
Biological characteristics can be predicted from the chemical structure
of the drug/metabolite.
E.g.
Paracetamol – Hepatotoxicity
Type D (Delayed) reactions
Occurs after many years of treatment.
Can be due to accumulation.
E.g.
Chemotherapy – Secondary tumours
Analgesics – Nephropathy.
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Type E (End of treatment)reactions
Occurs on withdrawal especially when drug is stopped abruptly.
E.g.
Phenytoin withdrawal – Seizures,
Steroid withdrawal – Adrenocortical insufficiency.
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Classification of ADRs depending on severity
Minor ADRs: No therapy ,antidote or prolongation of hospitalization is required.
Moderate ADRs: Requires change in drug therapy , specific treatment or prologs hospital
stay by at least one day.
Severe ADRs: Potentially life threatening ,causes permanent damage or requires intensive
medical treatment.
Lethal: Directly or indirectly contributes to death of the patient.
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References:
1.Rawlins MD, Thompson JW. Pathogenesis of adverse drug reactions. In: Davies DM, ed.
Textbook of adverse drug reactions. Oxford: Oxford University Press, 1977:10.
2. Aronson JK. Drug therapy. In: Haslett C, Chilvers ER, Boon NA, College NR, Hunter JAA,
eds. Davidson's principles and practice of medicine 19th ed. Edinburgh: Elsevier Science,
2002.
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Thank You!
www.clinosol.com
(India | Canada)
9121151622/623/624
info@clinosol.com
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@clinosolresearch
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Types of Adverse Drug Reactions (severity)

  • 1. Welcome Types of Adverse Drug Reactions Name : Ramesh Pothala Qualification: MSc(O.C) Student ID : 032/022023 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch
  • 2. Index Adverse drug reactions. Types of adverse drug reactions. Classification of adverse drug reactions based on severity. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 2
  • 3. Adverse Drug Reaction(ADR): Any noxious change which is suspected to be due to a drug, occurs at doses normally used in man ,requires treatment or decrease in dose or indicates caution in future use of same drug. Therefore ,an adverse drug reaction is an adverse event with a causal link to a drug. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 3
  • 4. Types Of Adverse Drug Reactions Type A (Augmented) Type B (Bizarre) Type C (Chemical) Type D (Delayed) Type E (Exit/End of treatment) Type F (Familial) Type G (Genotoxicity) Type H (Hypersensitivity) Type U (Un classified) 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 4
  • 5. Type A (Augmented) reactions Reactions which can be predicted from the known pharmacology of the drug. Dose dependent, Can be alleviated by a dose reduction. E.g. Anticoagulants – Bleeding, Nitrates – Headache. Type B (Bizarre) reactions Cannot be predicted from the pharmacology of the drug Not dose dependent, Host dependent factors important in predisposition E.g. Penicillin – Anaphylaxis. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 5
  • 6. Type C (Chemical)reactions Biological characteristics can be predicted from the chemical structure of the drug/metabolite. E.g. Paracetamol – Hepatotoxicity Type D (Delayed) reactions Occurs after many years of treatment. Can be due to accumulation. E.g. Chemotherapy – Secondary tumours Analgesics – Nephropathy. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 6
  • 7. Type E (End of treatment)reactions Occurs on withdrawal especially when drug is stopped abruptly. E.g. Phenytoin withdrawal – Seizures, Steroid withdrawal – Adrenocortical insufficiency. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 7
  • 8. Classification of ADRs depending on severity Minor ADRs: No therapy ,antidote or prolongation of hospitalization is required. Moderate ADRs: Requires change in drug therapy , specific treatment or prologs hospital stay by at least one day. Severe ADRs: Potentially life threatening ,causes permanent damage or requires intensive medical treatment. Lethal: Directly or indirectly contributes to death of the patient. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 8
  • 9. References: 1.Rawlins MD, Thompson JW. Pathogenesis of adverse drug reactions. In: Davies DM, ed. Textbook of adverse drug reactions. Oxford: Oxford University Press, 1977:10. 2. Aronson JK. Drug therapy. In: Haslett C, Chilvers ER, Boon NA, College NR, Hunter JAA, eds. Davidson's principles and practice of medicine 19th ed. Edinburgh: Elsevier Science, 2002. 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 9
  • 10. Thank You! www.clinosol.com (India | Canada) 9121151622/623/624 info@clinosol.com 5/5/2023 www.clinosol.com | follow us on social media @clinosolresearch 10