What are the possible side effects of diphenhydramine and phenylephrine?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using this medication and call your doctor at once if you have any of these serious side effects: • fast, pounding, or uneven heartbeat; • confusion, hallucinations, unusual thoughts or behavior; • urinating less than usual or not at all; • severe dizziness, anxiety, restless feeling, or nervousness; • easy bruising or bleeding, unusual weakness, fever, chills, body aches, flu symptoms; • increased blood pressure (severe headache, blurred vision, trouble concentrating, chest pain, numbness, seizure); or • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Less serious side effects may include: • blurred vision; • dry mouth; • nausea, stomach pain, constipation; • dizziness, drowsiness; • problems with memory or concentration; • ringing in your ears;
