Theophylline is considered an alternative medicine for persistent asthma in adults.

People with severe persistent asthma have symptoms almost all of the time.

They should not be used alone for persistent asthma.

Severe persistent asthma have symptoms almost all of the time.

Every 1 to 2 months for children with uncontrolled or severe persistent asthma.

With persistent asthma, you have symptoms more than once a week, but not constantly.

This combination is often used to treat persistent asthma.

If your child has persistent asthma, he or she may have:

Every 3 to 4 months for children who have moderate persistent asthma.

Those with persistent asthma should take control medications on a regular basis to prevent symptoms.