You don't need beta blockers or Viagra ! But even at this late date, you do need to visit your GP for advice ("risk assessment"), if you have not already done so, about travel to the Philippines. You might need to purchase and start antimalarials a week before you go. You should have been vaccinated against tetanus, hepatitis A, and typhoid. Other vaccines ( diphtheria, tuberculosis, hepatitis B, rabies, cholera) may be considered depending on where you travel and what you intend doing while you are in the country. There is a Vaccination information Service ( https://vis.spmsd.co.uk) with more details. I'm sure also you will have arranged comprehensive travel insurance.