Constipation means having a bowel movement fewer than every three days and the bowel motion may be hard and difficult to pass. People may strain in their attempt to empty their bowels. Constipation is also associated with pain on having a bowel movement, bloating, or a sense that the bowel has not emptied properly. This may be due to diet, fluid intake, lifestyle and age.
Bowel (How Can I Help Myself?) - Sussex MSK Partnership
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It may be useful to discuss medication with your GP or Pharmacist. There are several types of medications which act in different ways to help relieve bowel symptoms.
Ano-rectal Irrigation involves using warm water to stimulate more complete and effective evacuation by flushing out the lower bowel. This is something available on prescription and your physiotherapist will discuss this with you further if needed.