I contractes malaria tuesday and have been on coartem anti malaria drug 4 day course. i have travelled back to see my girlfreind in europe and have been taking viagra to help me perform and have sex as I am still quite weak. is this ok i just only see her 1 weekend every 5weeks so really want have Sex2-3x a day before I leave back. will this prolong my malaria or am i risking health issues?