Generics aren't Equivalent

I started taking Uceris a few years ago and was thankful when the generic Budesonide came out since it was a small fraction of the cost.

Why is it that the list of side effects for Uceris lists:

• headache,nausea,decreased blood cortisol,abdominal pain, fatigue, gas, bloating,
• acne.
• While the list of sides for Budesonide lists:
• 1. Bruising easily
  2. chills
  3. colds
  4. cough
  5. diarrhea
  6. fever
  7. general feeling of discomfort or illness
  8. headache
  9. hoarseness
  10. joint pain
  11. loss of appetite
  12. muscle aches and pains
  13. nausea
  14. runny nose
  15. shivering
  16. sneezing
  17. sore throat
  18. sweating
  19. trouble sleeping
  20. unusual tiredness or weakness
  21. vomiting

  Less common

  1. Bladder pain
  2. bleeding after defecation
  3. blistering, crusting, irritation, itching, or reddening of the skin
  4. bloody or cloudy urine
  5. blurred vision
  6. burning feeling while urinating
  7. burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
  8. changes in vision
  9. chest pain
  10. cough producing mucus
  11. decreased urine
  12. diarrhea
  13. difficult or labored breathing
  14. difficult or painful urination
  15. dizziness
  16. dry mouth
  17. eye pain
  18. fast, irregular, pounding, or racing heartbeat or pulse
  19. feeling of warmth
  20. heartburn
  21. increase in body movements
  22. increased thirst
  23. increased urge to urinate during the night
  24. irregular heartbeat
  25. lower back or side pain
  26. mood changes
  27. nervousness
  28. pain or discomfort in the chest, upper stomach, or throat
  29. pinpoint red or purple spots on the skin
  30. pounding in the ears
  31. rectal bleeding
  32. redness of the face, neck, arms, and occasionally, upper chest
  33. seizures
  34. severe constipation
  35. shakiness in the legs, arms, hands, or feet
  36. shivering
  37. skin rash, encrusted, scaly, and oozing
  38. slow or fast heartbeat
  39. stomach cramps or pain
  40. sweating
  41. swelling of the legs and feet
  42. swelling or puffiness of the face
  43. tightness in the chest
  44. trouble sleeping
  45. uncomfortable swelling around the anus
  46. upper abdominal or stomach pain
  47. waking to urinate at night
  48. weight gain or loss

  Incidence not known

  1. Bulging soft spot on the head of an infant
  2. change in the ability to see colors, especially blue or yellow
  3. difficulty with swallowing
  4. hives, itching, or skin rash
  5. puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue