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Decays of heavy pseudoscalar mesons $B$, $B_c$, $B_s$ and $D_s$ at LHCbupgrade are considered, which produce either two equal sign muons or taus. Inaddition, we consider the analogous decays with opposite sign muons or taus.All these decays are considered to be mediated by a heavy on-shell neutrino$N$. Such decays of $B$ mesons, if not detected, will give in general stringentupper bounds on the heavy-light mixing parameter $|U_{\mu N}|^2$ as a functionof the neutrino mass $M_N \sim 1$ GeV, principally due to the large expectednumber of produced mesons $B$. While some of the decays of the other mentionedmesons are attractive due to a weaker CKM-suppression, the expected producednumber of such mesons is significantly smaller that that of $B$'s; therefore,the sensitivity bounds from such decays are in general comparable or lessrestrictive. When $\tau$ pairs are produced, only two types of such decays aresignificant: $B^{\pm}, B_{c}^{\pm} \to \tau^{\pm} \tau^{\pm} \pi^{\mp}$ (and$\tau^{\pm} \tau^{\mp} \pi^{\pm}$), giving us stringent upper bounds on$|U_{\tau N}|^2$; the other decays with a pair of $\tau$, such as $B^0 \toD^{(*)-} \tau^+ \tau^+ \pi^-$ (and $D^{(*)-} \tau^+ \tau^- \pi^+$), areprohibited or very suppressed by kinematics.

Sensitivity bounds on heavy neutrino mixing $|U_{\mu N}|^2$ and $|U_{\tau N}|^2$ from LHCb upgrade