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D.A. II (Generic Chlorpheniramine)

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Why is this medication prescribed?

D.A. II is a medication typically prescribed to alleviate symptoms associated with respiratory conditions such as the common cold, allergies, or sinusitis. It contains three active ingredients:

  • Chlorpheniramine Maleate: This is an antihistamine that helps relieve symptoms like sneezing, itching, watery eyes, and runny nose caused by allergies or the common cold.
  • Methscopolamine Nitrate: This is an anticholinergic agent that helps reduce nasal secretions and may also alleviate symptoms like runny nose.
  • Phenylephrine Hydrochloride: This is a decongestant that works by narrowing blood vessels in the nasal passages, thereby reducing congestion.

How should this medicine be used?

D.A. II should be used according to the instructions provided by your healthcare provider or as indicated on the medication label. Here are some general guidelines for using D.A. II:

  • Dosage: Take the medication exactly as prescribed by your doctor. The dosage may vary depending on your age, medical condition, and response to treatment.
  • Administration: D.A. II is typically taken orally with water. Swallow the tablets whole; do not crush, chew, or break them unless instructed otherwise.
  • Timing: Follow the recommended dosing schedule provided by your doctor. It’s essential to take the medication at the same times each day to maintain a consistent level of the drug in your body.
  • Food: D.A. II can be taken with or without food. However, if it tends to cause stomach upset, taking it with food may help alleviate this side effect.
  • Duration of Use: Use D.A. II for the prescribed duration of treatment, even if your symptoms improve before the medication is finished. Stopping the medication prematurely may allow the symptoms to return.
  • Avoiding Certain Substances: Avoid consuming alcohol or taking other medications that may interact with D.A. II without consulting your healthcare provider first.
  • Missed Dose: If you miss a dose of D.A. II, take it as soon as you remember. However, if it’s almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to catch up.
  • Storage: Store D.A. II at room temperature away from light and moisture. Keep it out of reach of children and pets.

Always consult your healthcare provider if you have any questions or concerns about how to use D.A. II properly or if you experience any adverse effects while taking the medication.

Other uses for this medicine

D.A. II is primarily prescribed for respiratory conditions such as the common cold, allergies, or sinusitis due to its combination of active ingredients. However, there may be other off-label uses for this medication as determined by your healthcare provider. Off-label use means using a medication for a purpose other than what it’s officially approved for by regulatory authorities. Examples of off-label uses may include certain types of cough or congestion not directly related to colds or allergies, but these should be determined and supervised by a healthcare professional.

What special precautions should I follow?

When using D.A. II, there are several special precautions to keep in mind:

  • Medical History: Before taking D.A. II, inform your healthcare provider about your medical history, especially if you have any pre-existing conditions such as high blood pressure, heart disease, diabetes, thyroid problems, glaucoma, prostate problems, or urinary difficulties.
  • Allergies: Inform your doctor if you have any allergies to medications, especially antihistamines, anticholinergics, or decongestants.
  • Pregnancy and Breastfeeding: If you are pregnant, planning to become pregnant, or breastfeeding, discuss the risks and benefits of using D.A. II with your healthcare provider. It’s essential to weigh the potential risks to the fetus or infant against the benefits of treatment.
  • Children and Elderly: D.A. II may have different dosing and precautions for children and elderly individuals. Follow your doctor’s guidance regarding the use of this medication in these populations.
  • Interactions: D.A. II may interact with other medications, including prescription drugs, over-the-counter medications, and herbal supplements. Inform your healthcare provider about all the medications and supplements you are currently taking to avoid potential interactions.
  • Driving and Operating Machinery: D.A. II may cause drowsiness, dizziness, or blurred vision. Avoid driving, operating machinery, or engaging in activities that require mental alertness until you know how this medication affects you.
  • Alcohol: Avoid consuming alcohol while taking D.A. II, as it may increase the risk of side effects such as drowsiness or dizziness.
  • Overuse: Avoid exceeding the recommended dosage or using D.A. II for an extended period without consulting your healthcare provider, as this may lead to tolerance, dependence, or rebound symptoms.

Always follow your healthcare provider’s instructions and guidance when using D.A. II to ensure safe and effective treatment. If you have any questions or concerns about using this medication, don’t hesitate to discuss them with your doctor.

What special dietary instructions should I follow?

Regarding special dietary instructions for D.A. II, there are no specific dietary restrictions associated with its use. However, it’s generally recommended to take the medication with water and, if it tends to cause stomach upset, with food.

What should I do if I forget a dose?

  • Take it as soon as you remember: If it’s not too close to your next scheduled dose, take the missed dose as soon as you remember.
  • Skip the missed dose if it’s almost time for your next dose: If it’s nearly time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule.
  • Do not double up on doses: Do not take a double dose to make up for the missed one, as this can increase the risk of side effects.

What side effects can this medication cause?

D.A. II, like any medication, can cause side effects, although not everyone experiences them. Common side effects associated with D.A. II may include:

  • Drowsiness
  • Dizziness
  • Blurred vision
  • Dry mouth
  • Constipation
  • Difficulty urinating
  • Nausea
  • Upset stomach
  • Headache
  • Nervousness or restlessness

These side effects are usually mild and temporary. However, if any of these side effects persist or worsen, it’s important to inform your healthcare provider.

In some cases, D.A. II may cause more severe side effects or allergic reactions. Seek medical attention immediately if you experience any of the following:

  • Severe dizziness or fainting
  • Fast or irregular heartbeat
  • Difficulty breathing or swallowing
  • Severe allergic reaction (e.g., rash, itching, swelling of the face, tongue, or throat, severe dizziness, trouble breathing)

It’s important to note that this list may not include all possible side effects. If you experience any other unusual symptoms while taking D.A. II, contact your healthcare provider or pharmacist for further evaluation and advice. Additionally, if you have any concerns about the side effects of D.A. II, discuss them with your healthcare provider before starting the medication.

What should I know about storage and disposal of this medication?

Storage and Disposal:


  • Keep D.A. II in its original container, tightly closed, and out of reach of children and pets.
  • Store at room temperature away from light and moisture.
  • Avoid storing D.A. II in the bathroom or near heat sources.
  • Do not freeze D.A. II.
  • If you have any questions about storage, ask your pharmacist for advice.


  • Dispose of D.A. II properly according to local regulations or guidelines.
  • Do not flush medications down the toilet or pour them into a drain unless instructed to do so.
  • Check with your pharmacist or local waste disposal facility for information on how to dispose of unused or expired medications safely.

In case of emergency/overdose

  • If you suspect an overdose of D.A. II or experience severe symptoms such as difficulty breathing, seizures, loss of consciousness, or severe dizziness, seek emergency medical attention immediately.
  • In the United States, you can contact the Poison Control Center at 1-800-222-1222 for guidance on what to do in case of overdose.
  • Be prepared to provide information about the medication, dosage, and any other substances that may have been taken.

What other information should I know?

  • Keep all appointments with your healthcare provider and laboratory.
  • Do not share D.A. II with others, even if they have similar symptoms, as it may not be suitable for them and could cause harm.
  • If you are undergoing surgery, including dental surgery, inform your healthcare provider or dentist about all medications you are taking, including D.A. II.
  • Follow your healthcare provider’s instructions and guidance regarding the use of D.A. II, including dosage, timing, and duration of treatment.
  • If you have any questions or concerns about D.A. II or its use, consult your healthcare provider or pharmacist for clarification.

By adhering to these guidelines and being informed about storage, disposal, emergency procedures, and other relevant information, you can use D.A. II safely and effectively.

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