Doxylamine succinate is an antihistamine medication that can be used to treat nasal allergy symptoms, such as sneezing or nasal congestion, or insomnia, a type of sleep disorder. Typically, this medication is administered orally as a tablet or liquid. Patients should be aware of doxylamine succinate side effects before beginning to use this medication.
Upset Stomach
Patients may develop upset stomach after taking a dose of this medication. Gastrointestinal symptoms may include nausea or constipation, RxList reports. Constipation may also cause stomach pain, bloating or cramping in certain patients. To limit the severity of stomach upset side effects, patients should avoid taking doxylamine succinate on an empty stomach.
Nasal or Oral Dryness
This medication may cause nasal or oral dryness in treated patients, Drugs.com explains. If this occurs, patients may experience throat or nasal irritation, sneezing, increased thirst or sore throat. These side effects subside once treatment with this medication ends.
Drowsiness or Nervousness
Doxylamine succinate may induce drowsiness or fatigue in treated patients. Shortly after taking a dose of this medication, patients may appear drowsy or may fall asleep. Alternatively, certain patients, particularly children, may become unusually nervous or excited, MedlinePlus reports, or may have difficulty falling asleep. If these side effects become severe or occur in conjunction with heart rate irregularities, affected patients should talk with a doctor as soon as possible.
Increased Congestion
Increased or thickened mucus may develop within the nasal or respiratory passageways of patients taking doxylamine succinate. If this occurs, patients may experience a congested cough or may frequently blow their nose to expel excess mucus from the nostrils.
Dizziness or Headache
Sensations of dizziness or headache pain may arise in patients receiving treatment with doxylamine succinate, RxList reports. Patients who experience dizziness may appear disoriented, confused or unstable while standing or walking around. Head pain can be bothersome and may disrupt a patient's ability to remain focused while at school, home or work.
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