Thanks for the question.
There are many cause of such rectal bleed and bleed can occur from different sites of GIT. the usual causes are anal fissure
and cancer. Even blood coagulations and some medications can cause such bleeding. So your change in dosage might also be contributing to this.
Before treatment is started cause and site of the bleed has to determined and then only a specific treatment can be proposed. usually treatment is directed towards stopping bleeding and preventing rebleeding.
If sometimes bleeding is chronic then you may need evaluation for hemoglobin
. I think most likely cause in your case is bleeding through lower GIT as blood is fresh that is red in color.
I strongly suggest you to get a clinical evaluation done by a doctor, who will locate site of bleed and its likely cause. Investigations like colonoscopy
,sonogram and scan may also be needed. The issue can be serious if the bleeding increase or leads to anemia
I hope I have been helpful to you, Please ask if there are any doubts.