“…According to the literature, some of the barriers that could hamper the adherence are: mental health problems, mobility, stigma, risk misperception, the need to conceal PrEP use, social factors (e.g., unstable housing), substance use, cost or the potential side effects [ 15 , 16 , 17 ]. Although PrEP has not been associated with severe side effects (e.g., gastrointestinal symptoms, nausea, headache, loss of appetite or tiredness), while taking PrEP, a regular clinical and analytical follow-up every 3 months is required in order to evaluate tolerance, toxicity, adherence, HIV infection and other STDs [ 5 , 18 ].…”