For the first time last night this happened. I had some body ache from the air being to cold. I took some IBPro (800mg). It had only been about 20mins after taken pills I went to bed. Shortly afterwards my body started shaking, it scared me, it didn t seem as if my heart was racing.
Hi, Oh... cannot say in your particular case, but generally, there can be the STOPPING of a fever from any aspirin like Chat Doctor.  This is often associated with other reactions to the fever such as shivering and palpitations. There could be a reaction to the medicine, but that often is associated with a lot of other symptoms such as hives or itching. But sometimes when the medicine is just acting correctly, shivering results due to an underlying infection. Hope I have answered your query. Let me know if I can assist you further.