Common cold and allergy medications can have various side effects, depending on the active ingredients.
1. **Antihistamines**: These are often used for allergies and sometimes for cold symptoms. First-generation antihistamines like diphenhydramine can cause drowsiness, dry mouth, dizziness, blurred vision, constipation, and urinary retention. Second-generation antihistamines like loratadine and cetirizine are less sedating but can still cause headaches, dry mouth, and fatigue.
2. **Decongestants**: Medications like pseudoephedrine and phenylephrine are used to relieve nasal congestion. Side effects may include increased heart rate, elevated blood pressure, insomnia, nervousness, dizziness, and headaches. They can also cause urinary retention, especially in men with prostate issues.
3. **Cough Suppressants**: Dextromethorphan is a common ingredient. Side effects can include dizziness, nausea, drowsiness, and, in high doses, confusion or hallucinations.
4. **Expectorants**: Guaifenesin is used to thin mucus. It can cause nausea, vomiting, dizziness, headache, and rash.
5. **Nasal Sprays**: Steroid nasal sprays can cause nasal irritation, nosebleeds, sore throat, and, rarely, systemic effects like adrenal suppression. Decongestant nasal sprays can lead to rebound congestion if used for more than a few days.
6. **Combination Medications**: These may contain multiple active ingredients, increasing the risk of side effects from each component.
7. **Other Considerations**: Some medications can interact with other drugs, exacerbate existing health conditions, or be inappropriate for certain populations, such as children, pregnant women, or individuals with chronic health issues.
Always consult a healthcare provider for personalized advice and to ensure safe use of these medications.