Two of the country's minor political parties will join forces and merge in NSW in a bid to put assisted dying laws back on the legislative agenda.

The 1800 state members of the Voluntary Euthanasia Party have voted overwhelmingly to become the NSW branch of the Reason Party, originally founded as the Sex Party by Victorian upper house MP Fiona Patten.

Shayne Higson campaigning for the Wentworth byelection last year. She has run for the Voluntary Euthanasia Party five times. Credit:Wolter Peeters

Dying with Dignity vice-president Shayne Higson, who has run for the Voluntary Euthanasia party in two state elections, two federal elections and the Wentworth byelection, said being a single-issue party was an electoral liability.

"The feedback from our volunteers is that although people support our issue and would really love to send a message to a NSW Parliament, they are concerned about electing representatives who are running for a single-issue party," Ms Higson said.