My 22 year old son has been prescribed antidepressants, adderol, and ambien, and has been taking these for about 4 years. Due to a change in our insurance, his Pristiq scrip was changed to Effexor. At his last psychiatric s visit, his blood pressure was high. Advice was to take his own reading for a week and report back to the psychiatrist. His most recent reading today was 156 over 103, which seems quite high to me. Is Effexor a likely cause or might it be something else?