The best replacement for 018 is sy0 301.

The best alternatives to 018 are rated as following:
★★★★★  sy0 301
★★  jwh-250
★★  jwh 073
★  073
★  008
★  jwh-122
★  jwh 250
★  jwh-073
★  am-2201
  am 2201

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Speaking about 018, one probably shouldn't forget about damiana.

Other search terms related to 018 and their ratings are:
★★★★★ damiana
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018
sy0 301
jwh-250