Ajmaline is an alkaloid that is classified as a 1-A antiarrhythmic agent. It is often used to induce arrhythmic contraction in patients suspected of having Brugada syndrome.

Artemether is a medication used for the treatment of malaria. The injectable form is specifically used for severe malaria rather than quinine.  

Procaine Hydrochloride is the hydrochloride salt form of procaine, a benzoic acid derivative with local anesthetic and antiarrhythmic properties. Procaine binds to and inhibits voltage-gated sodium channels, thereby inhibiting the ionic flux required for the initiation and conduction of impulses. In addition, this agent increases electrical excitation threshold, reduces rate of rise of action potential and slows nerve impulse propagation thereby causing loss of sensation.

Tacrolimus is an immunosuppressive drug. It is used after allogeneic organ transplant to lower the risk of organ rejection and also as a topical medication in the treatment of T-cell-mediated diseases such as eczema and psoriasis.