Intracellular infections can cause a condition called secondary porphyria. The infection causes a build up of toxins inside infected cells. If an antibiotic is effective, one would expect apoptosis (cell death) of infected cells to occur, along with the subsequent release of toxic porphyrins.
Here’s how that might cause an increase in your blood pressure:
“Neurological-psychiatric symptoms of an acute intermittent porphyria are diverse and can occur in the form of peripheral nerve palsies, neuralgic pains, paresthesias, epilepsies, resentment and psychoses. The triad of cardiovascular symptoms, especially tachycardia and hypertension is completed. The acute intermittent porphyria is not associated with increased photosensitivity.”