What is an adverse reaction?
An adverse reaction refers to a harmful and unintended response that occurs after using a medicine, where a relationship to the medicine is reasonably suspected. It may be an extension of a known pharmacological action or an unpredictable reaction.
The fact that symptoms followed administration does not alone confirm the cause. An evaluation is made by comprehensively considering the onset of symptoms, dosage, changes after discontinuation, reactions upon re-exposure, and other possible causes.
How is this different from an adverse event?
An adverse event is a broad term used to record any unfavorable medical occurrence in a person using a medicine, and the medicine does not necessarily have to be the cause. It can include the original disease, infections, other medications, or coincidental events.
An adverse reaction is a narrower concept among these, where a relationship to the medicine is suspected. The number of reports in a safety database is not read as a confirmed number of cases caused by the medicine.
Is this the same as a side effect?
‘Side effect’ is a common term used by patients and the media to broadly describe uncomfortable symptoms after taking medicine. In medical and regulatory documents, effects other than the intended primary action, adverse events, and adverse reactions may be distinguished from one another, so the context must be checked.
During a medical evaluation, it is more important to describe specific symptoms, the time of onset, and the severity than to use the exact terminology. Rather than stopping at 'I think it is a side effect,' record what changed and how.
How is this different from an allergy?
A drug allergy can be a type of adverse reaction involving an immune response. Hives, swelling of the face, lips, or tongue, wheezing, and difficulty breathing may require prompt medical evaluation. Not all rashes or digestive symptoms are allergies.
Arbitrarily registering a single instance of discomfort as an 'allergy' may lead to avoiding necessary medications; conversely, a previous mild reaction does not mean re-exposure is safe. Medical staff make this determination based on records and tests if necessary.
How is the causal relationship determined?
We examine when symptoms appeared after starting a medication or changing the dose, how they changed after discontinuation or dose reduction, whether they match known reactions, and if there are other causes. If multiple medications were started simultaneously, the specific time and dose for each are required.
Re-exposure, which involves taking the same medication again to test for a reaction, can be dangerous and should not be done on your own. Please show the suspected medication, supplements, packaging, prescriptions, and test results to your medical staff.
What should I record?
Record the name and ingredients of the medication or supplement, the formulation and dose, the start date of administration, and the time of the last dose. Also note when symptoms started, when they were most severe, the duration, and any skin changes that can be captured in photos, pulse·blood pressureas well as body temperature.
and other prescription drugs, over-the-counter drugs, Korean herbal medicine, supplements, CaffeineDo not omit alcohol consumption. Also record any actions you took yourself due to the symptoms and the subsequent changes.
What is the difference between 'common' and 'severe'?
Even a reaction listed as 'common' in the medication guide may require medical evaluation if it is severe for an individual, and rare reactions can also be dangerous. Frequency and severity are not the same concept. We look at the impact on daily functioning, fluid intake, breathing, and consciousness.
Do not endure symptoms just because they are called 'common side effects,' nor exclude them because they are 'rare.' An individual's medical history and concomitant medications can change the risk level.
How does this relate to drug interactions?
drug interactionDrug interaction is a phenomenon where medications, foods, or supplements used together change the concentration or action of a drug. This can result in stronger-than-expected reactions, new symptoms, or decreased efficacy.
Even if an interaction is suspected, do not decide on the cause yourself and stop taking prescription medication. We determine the priority for adjustment by reviewing the full medication list and administration times.
Frequently missed information during weight management
Some people consider diet pills, injections, Korean herbal medicine, and supplements as different categories and only report some of them. For an actual evaluation, everything including vitamins, energy drinks, cold medicine, and items containing caffeine is necessary.
Low blood sugar on days of low food intake,blood sugardehydration, lack of sleep, and exercise can also cause tremors, dizziness,palpitationscan cause. While examining the relationship between symptoms and medication, lifestyle causes are also checked.
Can I keep taking it if the symptoms are mild?
The response varies depending on the medication and the patient's condition, even for the same symptom. Even if it seems mild, if it recurs or worsens, notify the prescribing institution before the next dose. Do not continue or stop taking medication simply because you found similar experiences on the internet.
If you have a personalized medication guide, prioritize those instructions. If there are new symptoms or added medications, get confirmation before taking them.
When to seek immediate help
Difficulty breathing, swelling of the face, lips, or tongue, chest pain, fainting, changes in consciousness, seizures, and severe skin or mucosal reactions require immediate evaluation. Seek prompt help if you cannot drink water due to repeated vomiting or diarrhea, or if urine output decreases significantly.
Do not force medication or food into a person with decreased consciousness. Contact 119 and provide information on the suspected medication, supplements, and the time they were taken.
If new symptoms occur while taking Baekrokgambijeong
If it is not an emergency signal, please notify Baekrokdam before your next dose. If you send photos of the symptoms, the start time, the time of your last Gambi-jeong dose, and a list of other medications or supplements, Korean medicine doctor Choi Yeon-seung will review them in connection with your current prescription to provide guidance on dosage adjustment, tests, or the next medical appointment.
Before considering visiting another hospital, please first provide the information needed to connect with your Baekrokdam prescription; however, in the case of emergency signals such as difficulty breathing, fainting, chest pain, or changes in consciousness, do not wait for a response and use 119 or an emergency medical institution.
Key points to remember when interpreting adverse reactions
Not all symptoms that occur during medication are caused by the medicine, but that does not mean they are not worth recording. We distinguish between adverse events and adverse reactions and evaluate the items taken, ingredients, dosage, and timing alongside other possible causes.
Do not test by redosing or arbitrarily change multiple medications. Seek immediate help for danger signals, and for any new symptoms while taking Baekrok Gambi-jeong, connect with the Baekrokdam medical staff before your next dose.
Even if symptoms have subsided, recording the time of occurrence and duration helps in establishing a safety plan for your next prescription.
Related Terms
Adverse reactions: clearer when viewed with these terms
A drug interaction is a phenomenon where the effect or side effect of one medication changes due to another drug, food, drink, health functional food, or a medical condition. The mere fact that they were taken together does not confirm an interaction, but you must disclose all prescription drugs, over-the-counter drugs, Korean herbal medicine, and supplements to allow for a risk assessment.
→ Comorbidities · Tests PalpitationsPalpitations are symptoms where the heartbeat feels more prominent or uncomfortable than usual. This includes feeling the heart beat fast, strong, skipping beats, or feeling irregular. However, the actual type or cause of arrhythmia cannot be determined by feeling alone, so the pulse, duration, and accompanying symptoms must be checked together.
→ Comorbidities · Tests EphedraMa Huang is a plant-based medicinal herb used in Korean herbal medicine prescriptions and may contain ephedrine-type alkaloids. The total amount of the herb is not the same as the amount of a specific component; since this varies depending on the species, part of the plant, processing, and prescription composition, individual prescriptions should not be calculated based on single values found on the internet.
→ Comorbidities · Tests EphedrineEphedrine is one of the alkaloid components that may be contained in Ma Huang, and it acts on the sympathetic nervous system to affect heart rate, blood pressure, and alertness. It is not synonymous with the Ma Huang herb as a whole, and the actual exposure amount in an individual prescription cannot be calculated by the weight of the herb alone.
→ Comorbidities · Tests CaffeineCaffeine is a central nervous system stimulant found in coffee, tea, energy drinks, and some medications. Because responses in alertness, sleep, and heart rate vary by person and time of intake even for the same amount, you should check your total daily intake and current medications rather than focusing on a single drink.
→Questions
Frequently Asked Questions about Adverse Reactions
Are all symptoms that occur after taking medicine considered adverse reactions?
No. An event occurring during medication can be recorded as an adverse event, but since it could be due to a disease, other medications, or lifestyle factors, the causal relationship must be evaluated.
Are side effects and adverse reactions the same thing?
While they are used interchangeably in daily conversation, their scope may differ in regulatory or medical contexts. It is more accurate to describe the specific symptoms and medication information.
If symptoms are mild, can I continue taking the medicine and monitor them?
It depends on the medication item and the symptoms. For any new symptoms while taking Baekrok Gambi-jeong, please notify the Baekrokdam medical staff before your next dose to receive individualized guidance.
If I report an adverse reaction, is the medicine confirmed as the cause?
Reporting is data used to find safety signals; the report itself does not prove a causal relationship. Multiple data points and clinical evaluations are required.
Medical professional who reviewed this text
Choi Yeon-seung
Chief Director of Baekrokdam Korean Medicine ClinicWe have reviewed the distinction between the terms adverse event, adverse reaction, and side effect, the recording of causality and cautions regarding redosing, emergency signals, and the communication pathway to the prescribing institution. During medical evaluations, we check actual symptoms, diet, sleep, and activity, not just numerical values.
- Graduated from Kyung Hee University College of Korean Medicine
- Practicing Korean medicine since 2010
- Specializing in constitution improvement and weight loss herbal medicine
- Content Authoring
- Baekrokdam Korean Medicine Clinic
- Content Reviewed by
- Dr. Choi Yeon-seung, KMD
- Review Scope
- Distinction between adverse event, adverse reaction, and side effect; recording of causality and cautions regarding redosing; emergency signals and communication pathway to the prescribing institution
- Last Reviewed
- August 24, 2026
This page provides general health information and does not replace individual diagnosis or prescription.
Source
Supporting Evidence
- Understanding CDER’s Postmarket Safety Surveillance Programs and Public Data ↗ U.S. Food and Drug Administration
- Finding and Learning about Side Effects Adverse Reactions ↗ U.S. Food and Drug Administration
- E2A Clinical Safety Data Management: Definitions and Standards for Expedited Reporting ↗ International Council for Harmonisation · U.S. Food and Drug Administration
- Have a safe diet by taking appetite suppressants correctly ↗ Korea Institute of Drug Safety & Risk Management