D-Hist D is a medication indicated to relieve symptoms associated with nasal allergies, such as sneezing and nasal congestion. This medication contains three active ingredients: pseudoephedrine, a nasal decongestant; dexchlorpheniramine, an antihistamine; and methscopolamine, which reduces excess fluid secretion in the body. People should be aware of D-Hist side effects before beginning treatment with this medication.
Excitability, Nervousness or Restlessness
Unusual feelings of excitability, nervousness or restlessness may occur in certain people who take this medication. These side effects of D-Hist D most commonly affect children, Drugs.com warns, which may make it difficult for youngsters to fall asleep or stay asleep through the night.
Blurred Vision, Headache or Dizziness
Treatment with this allergy medication may cause blurred or double vision in certain people. Vision changes may lead to head pain or can cause sensations of dizziness, RxList.com reports. Dizziness or blurred vision may cause people to appear disoriented, unstable or confused while attempting to move about normally. People who experience head pain following treatment with D-Hist D may also have difficulty remaining attentive or focused during work, school or social activities.
Upset Stomach
People may develop upset stomach side effects after taking a dose of D-Hist D. Gastrointestinal problems may include nausea, abdominal bloating or heartburn. Certain people may also experience difficulty producing a bowel movement, a side effect commonly referred to as constipation, Drugs.com explains. Eating a small snack or meal before taking this medication may help limit or prevent the development of upset stomach side effects in certain people.
Oral, Nasal or Ocular Dryness
D-Hist D may cause excessive oral, nasal or ocular dryness as a side effect of treatment. Oral dryness may cause thickened saliva, throat irritation, difficulty swallowing or increased thirst. People who experience nasal dryness may develop nasal itching or may begin sneezing. Dry eye, or ocular dryness, may result in eye irritation, such as red or itchy eyes. These side effects of D-Hist D are typically temporary and progressively subside once treatment with this medication ends.
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