Miralax, the brand name for the medication polyethylene glycol 3350, is a popular over-the-counter laxative commonly used to relieve occasional constipation. Understanding the appropriate Miralax dosage is crucial to ensure safe and effective relief. In this article, we will explore the recommended dosage guidelines for Miralax, considerations for different age groups, potential side effects, and general tips for its proper use. Remember, it’s always important to consult with a healthcare professional before starting any new medication or altering your dosage.

The Purpose of Miralax:

Miralax is an osmotic laxative that increases the stool’s water content, making it softer and easier to pass. It is commonly used to alleviate occasional constipation, whether due to dietary changes, travel, or certain medical conditions. Miralax is available over-the-counter without a prescription and is generally well-tolerated

Recommended Dosage:

  • The appropriate Miralax dosage may vary depending on individual needs and health conditions. It is essential to follow the instructions provided by your healthcare professional or those included in the packaging. The general recommended dosage for adults and children 17 years and older is as follows:
  • Constipation Relief: Start with a 17-gram dose (approximately one heaping tablespoon or the provided measuring cap) dissolved in 4 to 8 ounces of liquid once daily. This dosage can be adjusted based on the response and individual needs, with a maximum daily dose of 34 grams.
  • Bowel Preparation: For colonoscopy or other gastrointestinal procedures, your healthcare professional will prescribe a specific Miralax bowel preparation regimen. It typically involves higher doses taken over a specific period, following strict guidelines provided by your healthcare professional.

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Miralax Dosage for Children:

  • Miralax can also be used for children. However, it is important to consult a pediatrician for appropriate dosing based on the child’s age, weight, and medical history. The recommended dosage for children varies as follows:
  • Children 6 to 16 years old: The starting dosage is typically half the adult dosage, or 8.5 grams (approximately one level tablespoon) dissolved in 4 to 8 ounces of liquid once daily. The dosage can be adjusted as needed, with a maximum daily dose of 17 grams.
  • Children under 6 years old: Miralax in children under 6 years old should be discussed with a pediatrician. The dosage and frequency will be determined based on the child’s needs and health conditions.

Considerations and Precautions:

  • While Miralax is generally safe, there are a few important considerations to keep in mind:
  • Medical Conditions: Individuals with specific health conditions, such as kidney disease, heart failure, or gastrointestinal obstruction, should consult their healthcare professional before using Miralax. Adjustments to the dosage or alternative treatments may be necessary.
  • Other Medications: Inform your healthcare professional about all the medications you are taking, including prescription, over-the-counter, and herbal supplements. Certain medications may interact with Miralax, potentially affecting its efficacy or safety.
  • Side Effects: Miralax is usually well-tolerated, but some individuals may experience mild side effects such as bloating, gas, or diarrhea. If you experience severe or persistent side effects, contact your healthcare professional.
  • Duration of Use: Miralax is intended for short-term use to relieve occasional constipation. If constipation persists or worsens, consult your healthcare professional to identify and address the underlying cause.

Tips for Proper Use:

To ensure the best results and minimize the risk of side effects, consider the following tips when using Miralax:

  • Follow Instructions: Read and follow the dosing instructions provided by your healthcare professional or those included in the packaging carefully. Do not exceed the recommended dosage or duration of use without medical guidance.
  • Mixing and Administration: Miralax should be dissolved in a beverage you choose, such as water, juice, or clear soup. Stir until fully dissolved and consume immediately. Avoid mixing Miralax with carbonated beverages or hot liquids.
  • Adequate Hydration: Drinking plenty of fluids while taking Miralax is important to maintain proper hydration. Adequate hydration helps the medication work effectively and prevents dehydration.
  • Dietary Fiber: Incorporating fiber-rich foods, such as fruits, vegetables, and whole grains, can support healthy bowel movements. Consult with a healthcare professional or registered dietitian for personalized dietary recommendations.
  • Lifestyle Changes: Alongside Miralax, consider making lifestyle changes to promote regular bowel movements, such as regular exercise, a balanced diet, and managing stress levels.


Miralax is a widely used over-the-counter laxative that can effectively relieve occasional constipation. Understanding the appropriate Miralax dosage for your age group and individual needs is crucial to ensure safe and effective use. Remember to consult a healthcare professional before starting or adjusting your Miralax dosage, especially if you have any underlying health conditions or are taking other medications. Following the recommended dosage, considering precautions, and adopting healthy lifestyle habits can contribute to a more comfortable and regular bowel function.