question: my dad is 70 yrs old.he has got a BP of 170/100.last month it was 160/90.recently complained of a mild shiver feeling.since then he has got a mild headache alternately on the two sides.at present he is taking (i) cilacar 10 mg(ii) zurig 80 mg (iii) thyroid 12.5 mg(iv) ketosteril 2 tab twice daily. for treatment of high creatine and uric acid.is the headche a side effect of the medicine he is taking?