The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Sleepiness
- Dizziness
- Trouble with coordination or movement
- Stomach pain or discomfort
- Thick mucus in the lungs
Less Common Side Effects
- Skin sensitivity to light
- Chills
- Dry mouth, nose, or throat
- Low blood pressure
- Headache
- Fast heartbeat
- Tiredness
- Confusion
- Irritability
- Trouble sleeping
- Blurry vision
- Nausea
- Vomiting
- Trouble urinating
Karbinal ER serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Serious allergic reaction: rash, hives, itchiness, shortness of breath, chest tightness; swelling of lips, tongue, face, or eyes
Source: DailyMed
The following Karbinal ER side effects have also been reported
Side effects that you should report to your care team as soon as possible:
- Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
- Sudden eye pain or change in vision such as blurry vision, seeing halos around lights, vision loss
- Trouble passing urine
Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):
- Confusion
- Constipation
- Dizziness
- Drowsiness
- Dry mouth
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