Oral asthma medication are not the first line of treatment for asthma. They are mainly used in stage-III and stage IV of asthma control as an add on to the inhaled medications. Though in some poor countries oral medications are used as the first resort due to their less cost. Oral medications have more side effects than inhaled forms and are also less effective. Consult a asthma specialist before trying any medicine. if you want to read more about oral asthma medication vivit the links below:

Aminophylline tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a601015.html

Theophyllin tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a681006.html

Salbutamol (Albuterol) tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a607004.html

Prednesolone tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a601102.html

Methylprednisolone tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a682795.html

Montelukast tablets:
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a600014.html