Follow these simple steps to use this medicine correctly:

1. Take the tablet whole with a full glass of water.
   
   
2. Do not chew, crush, or break the tablet.
   
   
3. Take it with or without food.
   
   
4. Take it at the same time each day, depending on whether it’s a 12-hour or 24-hour tablet.
   
   
5. Do not take more than the recommended dose.
   
   
6. Avoid fruit juices and alcohol while taking this medicine.
   
   

If you miss a dose and it’s not close to your next dose, take it when you remember. If it’s almost time for the next one, skip the missed dose. Do not take two doses at once.

This medicine works by combining the effects of two different drugs:

• Fexofenadine blocks the action of histamine, a chemical in the body that causes allergy symptoms like itching, runny nose, and sneezing. It does this without making you very sleepy, which makes it good for daytime use.
  
  
• Pseudoephedrine is a nasal decongestant. It works by shrinking the blood vessels in your nose and sinuses. This helps reduce swelling and allows your nose to feel less blocked, making it easier to breathe.
  
  

Together, these two ingredients provide complete relief from both allergy and congestion symptoms, which makes this combination very useful for people suffering from seasonal allergies, sinus pressure, or cold-like symptoms.

Like all medicines, this combination can cause some side effects, although not everyone gets them.

Common side effects may include:

• Headache
  
  
• Dizziness
  
  
• Trouble sleeping (insomnia)
  
  
• Nervousness or restlessness
  
  
• Dry mouth
  
  
• Upset stomach
  
  

Less common but serious side effects:

• Fast or irregular heartbeat
  
  
• High blood pressure
  
  
• Severe allergic reaction (rash, itching, swelling, difficulty breathing)
  
  

Because pseudoephedrine is a stimulant, it can cause nervousness or trouble sleeping, especially in sensitive people or those who take it late in the day.

If you notice any unusual or serious side effects, stop taking the medicine and call your doctor right away.

Before taking this medicine, make sure to read the warnings and talk to your doctor if needed.

Do not use this medicine if you:

• Have uncontrolled high blood pressure
  
  
• Have severe heart disease
  
  
• Have taken an MAO inhibitor in the past 14 days
  
  
• Have glaucoma
  
  
• Have urinary retention problems (trouble urinating)
  
  
• Are pregnant or breastfeeding, unless approved by your doctor
  
  

People with kidney problems may need a lower dose. Let your doctor know about any medical conditions you have.

This medicine may affect sleep, so avoid taking it close to bedtime. Also, avoid alcohol as it can increase side effects like dizziness.

This medicine can interact with other drugs:

• Blood pressure medicines: Pseudoephedrine may raise your blood pressure. Avoid if you have high blood pressure unless your doctor approves.
  
  
• MAO inhibitors: These are older antidepressants. Do not use this allergy medicine if you’ve taken an MAO inhibitor in the last 14 days.
  
  
• Other decongestants: Taking multiple decongestants together may increase the risk of side effects like high blood pressure, nervousness, or heart problems.
  
  
• Fruit juices like orange or grapefruit can lower how well Fexofenadine works. Always take it with plain water.
  
  

Let your doctor or pharmacist know about all medicines you are using, including herbal and over-the-counter products.

There are two main types of this combination:

1. 12-hour tablet: Take one tablet every 12 hours. Do not take more than 2 tablets in 24 hours.
   
   
2. 24-hour tablet: Take one tablet once a day.
   
   

Always take it with plain water, and avoid fruit juices which can reduce how well Fexofenadine works.

Do not change your dose or take extra tablets without talking to your doctor. Overuse of pseudoephedrine

In many places, Fexofenadine and Pseudoephedrine combination medicines are behind the pharmacy counter, even though they are not prescription-only.

This is because pseudoephedrine can be used to make illegal drugs, so pharmacies keep it in a secure area. To buy it, you may need to:

• Show a valid photo ID
  
  
• Sign a logbook
  
  
• Follow purchase limits (you can only buy a certain amount per month)
  
  

In some countries or states, this combination may require a prescription, especially for higher strengths or frequent use.

Even if it’s non-prescription in your area, always talk to a pharmacist or doctor if you have other health conditions, or are taking other medicines.

• What is Fexofenadine and Pseudoephedrine used for?
  It is used to relieve symptoms of seasonal allergies (hay fever) such as:

  • Sneezing, runny or itchy nose

  • Itchy or watery eyes

  • Nasal congestion or sinus pressure

  This combination provides dual relief — Fexofenadine reduces allergic reactions, while Pseudoephedrine clears nasal congestion.

• What are the brand names?
  Allegra-D® 12 Hour, Allegra-D® 24 Hour, and various generic equivalents.

• What are the active ingredients?

  • Fexofenadine hydrochloride: a non-sedating antihistamine

  • Pseudoephedrine hydrochloride: a nasal decongestant (sympathomimetic agent)

• How does this combination work?

  • Fexofenadine blocks histamine (H₁) receptors, reducing sneezing, itching, and watery eyes.

  • Pseudoephedrine constricts blood vessels in the nasal passages, reducing swelling and congestion.

• What type of medication is it?
  A combination antihistamine and decongestant used for allergic rhinitis and nasal congestion relief.

• How is it taken?

  • Orally, as extended-release tablets.

  • Swallow whole with water — do not crush or chew.

  • Take on an empty stomach (at least 1 hour before or 2 hours after a meal).

• What are the available strengths?

  • Allegra-D 12 Hour: Fexofenadine 60 mg / Pseudoephedrine 120 mg (taken twice daily)

  • Allegra-D 24 Hour: Fexofenadine 180 mg / Pseudoephedrine 240 mg (taken once daily)

• How long does it take to work?
  Starts working within 1 hour; full effect in 2–3 hours.
  Relief lasts 12 to 24 hours, depending on the product strength.

• What are the common side effects?

  • From Fexofenadine: Headache, mild dizziness, nausea, or fatigue

  • From Pseudoephedrine:

    • Nervousness or restlessness

    • Insomnia

    • Increased heart rate or blood pressure

    • Dry mouth

• Are there serious side effects?
  Rare, but possible:

  • Severe allergic reaction (rash, swelling, breathing difficulty)

  • Fast or irregular heartbeat

  • Chest pain

  • Severe dizziness or confusion

• Who should not take this combination?

  • People with severe high blood pressure or heart disease

  • Those with narrow-angle glaucoma

  • Individuals with urinary retention or prostate problems

  • Patients taking or who recently took MAO inhibitors (within 14 days)

  • Those with severe kidney disease

• Can this medication cause drowsiness?
  Fexofenadine is non-sedating, but Pseudoephedrine may cause nervousness or sleeplessness, not drowsiness.

• Can I take it at night?
  Avoid taking it close to bedtime, as Pseudoephedrine can cause insomnia or restlessness.

• Can I drink coffee or energy drinks while on it?
  Use caution — caffeine can increase restlessness, jitteriness, and heart rate.

• Can it be taken during pregnancy?
  Use only if clearly needed — Pseudoephedrine is not recommended in early pregnancy due to possible effects on blood flow.
  Always consult a doctor first.

• Can I take it while breastfeeding?
  Not recommended — Pseudoephedrine can reduce milk production and may cause irritability in infants.

• Does it interact with other medications?
  Yes — avoid or use with caution if taking:

  • MAO inhibitors (e.g., selegiline, phenelzine) — dangerous increase in blood pressure

  • Blood pressure medications or beta-blockers — may reduce their effect

  • Other decongestants or stimulants — increases heart and blood pressure risks

• Can I take it if I have high blood pressure?
  Only under medical supervision — Pseudoephedrine can raise blood pressure and heart rate.

• What should I do if I miss a dose?
  Take it as soon as you remember unless it’s near the next scheduled dose — don’t double up.

• Can I take it long-term?
  Not recommended — use for short-term allergy or congestion relief unless advised by a healthcare provider.

• How should I store it?
  Store at room temperature (20°C–25°C / 68°F–77°F), away from heat and moisture.

• Is there a generic available?
  Yes — Fexofenadine + Pseudoephedrine combination tablets are available generically.

• Where can I buy it?
  Available over the counter (OTC) in most pharmacies, but often kept behind the counter (photo ID required in the U.S.) due to pseudoephedrine regulations.