The 47-year-old client is experiencing chest pain and has taken three sublingual nitrogylcerin tablets, but the pain remains. What should the client do next?

Nitrogylcerin tablets  are usually used for the prevention and mitigating the chest pain or  Angina pectoris  due to complications from   coronary diseases.  The tablets should be, placed under the tongue; and  allow to dissolve without  spiting, swallowing or drinking any fluid. The tablets are 3 in  number,and should be taken at 5-minutes intervals to suppress the pain.if after the 15 minutes completion of the 3 tablets dosage the pain still persists, emergency care team  should be contacted e.g 911.