- Certain kinds of strokes (Brain strokes)
- Change in sex ability
- Change in thinking clearly
- Chest Tightness
- Chest pain
- Chest pain or pressure (angina)
- Chronic digestive disease
- Chronic digestive problem
- Chronic obstructive pulmonary disease (COPD)
- Chronic renal failure
- Cleansing skin
- Cold sores
- Common Cold symptoms
- Common cold
- Congestion
- Congestion or Stuffiness
- Congestive heart failure
- Congestive heart failure
- Constipation
- Contraception with intermittent administration
- Control your blood pressure
- Cough
- Cough with mucus
- Cramps
- Cushing's syndrome
- Cystic fibrosis
