When I asked Kathrynne Holden, an expert on PD and food, nutrition and constipation, about the safety of an over-the-counter laxative called MiraLAX® she responded as follows:
“Although it’s best to control constipation with fiber, fluids, and exercise, sometimes that’s not possible. If not, then it’s better to use MiraLAX® than to risk bowel impaction.
MiraLAX® was developed for constipation due to slowed peristalsis of the colon, and is generally the best choice for those with PD.
I would still choose high-fiber foods and be certain to take in plenty of fluids daily. Also, as much exercise as is possible will help to stimulate peristalsis. Here is a recipe used in many hospitals which has been helpful for quite a number of folks with PD:
Prune Juice Cocktail for Constipation
For people with frequent constipation, a safe and effective remedy is the "prune juice cocktail," a preparation used in many hospitals.
½ cup unsweetened applesauce 4 tablespoons wheat bran 6 ounces prune juice
Mix well, and store in refrigerator. Take a tablespoonful a day at first, gradually adding more if needed, until you find the amount that works well for you. The bran helps keep the stool bulky and soft, the prune juice contains a natural laxative, and the applesauce gives a palatable taste and texture. Aim for 25 - 40 grams of fiber in the daily diet, and drink 6-8 glasses of fluid daily. It may be helpful to also have a serving of 4-6 stewed prunes 2-4 times per week, for added fiber and additional natural laxative.
This recipe makes about 10 fluid ounces total. The nutrients for the entire recipe are as follows: 209 calories 6 grams fat 3 grams protein 54 grams carbohydrates 10 grams fiber 22 grams total sugars
The nutrients per serving will depend upon how much is taken at a time. One ounce (about two tablespoons), will be about:20 calories, 5 grams carbohydrate, 1 gram fiber, and 2 grams total sugars.”