What side effects can this medication cause 

Aliskiren may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• diarrhea
• stomach pain
• heartburn
• cough
• rash

Some side effects can be serious: 
If you experience any of these symptoms, call your doctor immediately:

• swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
• hoarseness
• difficulty swallowing or breathing
• lightheadedness
• fainting

Aliskiren may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.