Yes, side effects can occur after long term uses. It may be -
Habit formation / dependency
Lazy bowel (reduced natural peristalsis)
Electrolyte imbalance (especially low potassium)
Abdominal cramps, gas, bloating
Loose motions or dehydration
Worsening constipation when stopped suddenly (rebound constipation)
Next Steps
High-fiber diet (fruits, vegetables, soaked flaxseed)
Warm water in morning
Isabgol (psyllium husk) at night
Triphala churna (in small dose, not daily forever)
Treating root cause (low fiber, stress, gut imbalance, hypothyroid, etc.)
Health Tips
Do not stop kayam suddenly after 1 year—taper gradually
If constipation persists >3 months, evaluation is needed