3 Side Effects, Precautions, and Medication Safety
Learn how to recognize and respond to medicine side effects, identify precautions and interactions, and share useful information when seeking care or reporting a possible problem.
Understanding side effects
Medicines can provide benefits and also cause unwanted effects. A may be mild and temporary, or serious and require prompt care. Risks vary with the specific medicine and can also be affected by a person’s health conditions and other medicines or supplements.
Use each medicine’s label and patient information for its specific warnings. If instructions are unclear, ask a pharmacist or prescriber.
Managing mild symptoms
Nausea, stomach upset, dry mouth, headache, and drowsiness are examples of effects some medicines may cause. These examples do not predict what will happen with every medicine; check that medicine’s own information to learn which effects are expected and what to do about them.
For a mild effect, note when it began, how severe it is, and whether it changes. Ask a pharmacist or clinician how to manage it. Do not change the dose or stop treatment on your own unless the medicine’s instructions or a clinician tell you to.
Recognizing urgent warning signs
Contact a clinician promptly about a new, severe, worsening, or persistent symptom, or any warning sign listed in the medicine’s instructions. Examples that may need prompt evaluation include unusual bleeding, severe or persistent vomiting, yellowing of the skin or eyes, and a widespread rash. The meaning and urgency of a symptom depend on the medicine and the person’s health, so follow medicine-specific guidance and seek professional advice.
Call 911 for a possible medical emergency. Warning signs include difficulty breathing; sudden swelling of the lips, mouth, tongue, or throat; fainting; seizure; severe confusion; or inability to wake. These can signal a life-threatening reaction. Do not wait for a routine appointment.
Precautions and interactions
Before starting a medicine, tell the prescriber or pharmacist about allergies, medical conditions, pregnancy or breastfeeding, and all medicines and supplements you take. Include over-the-counter products and remedies used only occasionally.
An or other reaction may arise between medicines, foods, supplements, or an existing condition. Ask what to avoid, whether monitoring or tests are needed, and which symptoms mean you should call a clinician or seek emergency care.
Keep the medicine’s patient information accessible; it may list common and serious effects, precautions, and steps to take if a reaction occurs. Do not assume an effect is harmless simply because another person taking the same medicine did not experience it.
Sharing information and reporting
When contacting a clinician about a possible , be ready to share:
The medicine’s name and dose.
When you took it and when the symptom began.
What the symptom feels like.
Any other medicines or supplements you use.
Keep a written note of symptoms and questions. A clinician or pharmacist can help determine what to do next. In the United States, patients can also report suspected medicine problems to the FDA’s program. Reporting does not replace urgent medical care.