Figure 3

(a) In susceptible users’ fraction stochastic Euler method converges to drug-free equilibrium, while deterministic solution is the mean of stochastic Euler method solution for \(h=0.01\). (b) In susceptible users’ fraction stochastic Euler method fails to maintain the positivity and diverges for drug-free equilibrium for \(h=5\). (c) In drug users’ fraction stochastic Euler method converges to drug-present equilibrium, while deterministic solution is the mean of stochastic Euler method solution for \(h=0.01\). (d) In drug users’ fraction stochastic Euler method shows negativity and unstable behavior for drug-present equilibrium for \(h=5\)