Comment # 1 on bug 1175678 from Hans Schwimmbeck

Because there is no equivalent to Debians apt autoremove in openSUSE, I made a
little script which tries to mimic it and resides as zypper_autoremove in
/usr/local/bin.

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#!/bin/sh

zypper rm -u $(zypper pa --unneeded | grep 'i |' | cut -d'|' -f3 | tr -d ' ' |
uniq | tr '\n' ' ')
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The command in brackets prints a list of unneeded packages separated by blanks.
This list can be used by "zypper rm -u" to remove the packages recursively.

It has to be run as root and should work as long as the output format of
"zypper pa --unneeded" does not change.
Of course it should be used with care!

An "official" solution would be very much appreciated.