Webbegin taking miralax ® at the first signs of constipation and continue taking until you experience relief (up to seven days). How much miralax® can you take? Webaug 27, 2024 · dosage for constipation in adults. The typical miralax powder dosage for adults with constipation is 17 g once per day. Do not take miralax for more than 7. Webaccording to miralax’s official website, it is recommended that you take miralax for no more than 7 days in a row. If you still have severe constipation after taking it daily for one week, you should consult your doctor. Can miralax be taken with other medications? Websep 16, 2024 · dosage for constipation. Doctors may recommend miralax to treat constipation. The typically recommended dosage of miralax for constipation is 17 g. Webmar 22, 2024 · for relief of constipation, you can take one dose of miralax at any time of the day for up to 7 days. You may prefer to take it early in the day so that it’s less likely.