Hypokalemic paralysis is a side effect of:
Gossypol

It is a male contraceptive pill which contains-Disequilterpene aldeayde
Discovered in china from an extract of cottonseed.
Mechanism of action it inhibits spermatogenesis and decreases epididymal sperm motility.
Side effect - Hypokalemic paralysis in 1% patients

Other male hormonal contraceptives:
Testosterone enanthate injectable
Testosterone bucolate injectable
Gossypol
DMPA
Testosterone enanthate
Cyproterone acetate