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Related Concept Videos

Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Dosage Regimen: Fixed Dose01:01

Dosage Regimen: Fixed Dose

Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
Fixed-dose regimens can be used for various routes of administration, including intravenous (IV) injections and oral medications. For IV administration, a predetermined amount of the drug is...
Pharmacovigilance01:19

Pharmacovigilance

Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
This process, termed pharmacovigilance, aims to detect, evaluate, and minimize harmful effects related to medication use. The data collection for pharmacovigilance depends on spontaneous reporting systems, where healthcare professionals or patients voluntarily report suspected ADRs.
In some cases, there...
Drug Accumulation During Multiple Dosing: Intermittent IV Infusions01:24

Drug Accumulation During Multiple Dosing: Intermittent IV Infusions

Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...

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Updated: May 10, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
10:17

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry

Published on: April 23, 2019

Modafinil-induced Fixed Drug Eruption.

Girish Vasant Gaikwad1, Chetali Vijay Dhuri

  • 1Department of Pharmacology, Topiwala National Medical College and BYL Nair Hospital, Mumbai Central, Mumbai, Maharashtra, India.

Indian Journal of Psychological Medicine
|June 1, 2013
PubMed
Summary
This summary is machine-generated.

Modafinil, a wakefulness-promoting drug, can rarely cause severe skin reactions like fixed drug eruption. This case report links a single modafinil dose to this serious adverse drug event.

Keywords:
Adverse drug reactionfixed drug eruptionmodafinil

Related Experiment Videos

Last Updated: May 10, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
10:17

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry

Published on: April 23, 2019

Area of Science:

  • Pharmacology
  • Dermatology
  • Clinical Neurology

Background:

  • Modafinil is a commonly prescribed stimulant for promoting wakefulness.
  • While generally safe, it carries a risk of uncommon but severe dermatologic reactions.
  • Awareness of potential adverse drug events is crucial for patient safety.

Observation:

  • A patient developed a fixed drug eruption following a single dose of modafinil.
  • The reaction presented as a significant dermatologic side effect.
  • Diagnostic assessment utilized the Naranjo scale to evaluate causality.

Findings:

  • The Naranjo scale score of five indicated a probable causal link between modafinil and the adverse drug event.
  • Fixed drug eruption is a serious, albeit rare, dermatologic reaction to medications.
  • This case underscores the potential for modafinil to trigger severe cutaneous adverse reactions.

Implications:

  • Healthcare providers should maintain vigilance for dermatologic side effects in patients using modafinil.
  • Early recognition and management of drug-induced skin reactions are essential.
  • Further research may be warranted to understand the mechanisms of modafinil-induced dermatologic reactions.