Components
効く is an exact match with one form of the following word:
効く
BOOST
Reading : きく   
'ku' godan verb, intransitive verb
1. to be effective; to show effect  (see also: 薬が効く)
2. to do its work; to carry out its function well  (see also: 目が利く)
3. to be possible to use  (see also: 割引が効く)
My mastery:
My current mastery of 効く:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 4 (among the 5,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 122,480 which gives a rank of 2,700
効く is the most useful form. 2 additional forms are shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 60% of the time
• Google Japan frequency rank: 20,000 (about 32,200,000 results)
• This form appears in Wikipedia's list of JLPT N3 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 3370 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 10046
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form is used as an example of an official Joyo kanji reading
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Example sentences:
この
くすり
きみ
よく
おも

I think this medicine will do you a lot of good.
その
くすり
よく
いた

That medicine worked well for me.
かれ
しょほう
処方
してくれた
くすり
かなかった

The medicine he had prescribed failed to take effect.
Useful expressions:
View useful expressions in EXPRESSION SEARCH
利く
BOOST
Reading : きく   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 70,000 (about 4,610,000 results)
• iknow! Core 6000 rank: 5488 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 3743
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form is used as an example of an official Joyo kanji reading
VIEW INFLECTIONS
きく
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 30% of the time
• Google Japan frequency rank: 33,000 (about 17,400,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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コウ   effective   き to be effective   
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リョク   リキ   ちから effort; power   
コウ   mix; mixed   まぜる to mix, stir   まざる    まじる to be mixed together   まじえる to mix, intersperse   まじわる to intersect   か to take turns   かわす to exchange   
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ロク   むっ six   む    むい    む    
フ   ちち father   
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katakana 'ha'; eight
crossed swords
リ    effective, interest, profit, advantage   き to be effective   
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grain
トウ   かたな sword   
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