Differences Between Zyrtec D & Allegra D


Zyrtec-d and allegra-d are antihistamines that stop the production of the natural chemical histamine in the body. Drugs.com states that they both help to prevent allergy symptoms such as runny nose, sneezing, itchy and watery eyes and congestion. The differences between the medications lie within the warnings and possible side effects.

Zyrtec-D: Warnings

  • Drugs.com warns that those who have narrow-angle glaucoma, high blood pressure, severe coronary artery disease, troubles urinating or are allergic to hydralazine should not use zyrtec-d. Patients should also consult their doctors if they have heart disease, diabetes, a thyroid disorder, glaucoma, kidney disease, liver disease, an enlarged prostate or bladder troubles, as this medication could cause further troubles. As of now, it is not known if zyrtec-d can cause birth defects to unborn children.

Zyrtec-D: Side Effectts

  • Serious side effects associated with zyrtec-d include fast or pounding heart, weakness, extreme feelings of fear and confusion, increase blood pressure, headache, blurred vision, seizure, trouble breathing, chest pain and troubles urinating, states drugs.com. Less serious side effects include dizziness, drowsiness, tired feeling, dry mouth, nausea and ringing in the ears. If you experience any of the serious side effects, immediately contact your doctor.

Allegra-D: Warnings

  • As with any cough medicine, ask your doctor about usage before taking this drug, as it can cause harmful affects to your body is misused. As explained by drugs.com, those using an MAO inhibitor such as "isocarboxazid (Marplan) or phenelzine (Nardil)," should not use allegra-d. Those with kidney o disease, glaucoma, diabetes, hypertension (high blood pressure), heart problems, enlarged prostate, bladder problems and thyroid disorder, should also avoid taking this drug or speak to their doctors before using it.

Allegra-D: Side Effects

  • Serious side effects include uneven heart beat, pounding heart beat, confusion, hallucinations, unusual behavior, severe dizziness, anxiety, nervousness, severe headache, and an increase in blood pressure. Other serious side effects include easy bruising and bleeding, weakness, flu symptoms, and urinary retention, explains drugs.com. Less serious side effects include dry mouth, stomach ache, constipation, nausea, tingling or redness of the skin, rash, insomnia, concentration problems and dizziness.


  • Avoid taking any depression or anxiety pills while taking these medications, as well as caffeine or diet. Any of these pills can increase the risk of certain side effects. Take these medications as prescribed and if any of the above side effects persist or worsen, contact your doctor. It is apparent that allegra-d has more side effects associated with use, yet it is up to you and your doctor to choose the drug that is right for you.

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