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I want to draw two icons (pill and capsule), and these icons can repeat and resize.

Minimal working code from How to draw a water droplet in Latex?:

documentclassarticle
usepackagetikz
usetikzlibrarycalc
newcommanddroplet%
 begintikzpicture
 coordinate (a) at (0,1.5);% Change 1.5 to change the shape of the droplet
 node [circle,draw,fill=blue,blue] (c) at (0,0) [minimum size=40pt] $c$;
 draw[blue,fill] (a) -- (tangent cs:node=c,point=(a),solution=1) --
 (c.center) -- (tangent cs:node=c,point=(a),solution=2) -- cycle;
 endtikzpicture%

begindocument

droplet quad droplet

enddocument

Two icons can be together or alone, and repeat and resize.

The following has some (hopefully) self-explaining pgfkeys that control their dimensions in order to make it easier to scale them. Do not consume them in combination with alcohol or when maneuvering heavy machinery. ;-)

documentclassarticle
usepackagetikz
usepackagetikz-3dplot
begindocument
tdplotsetmaincoords7000
begintikzpicture[rotate=-45,tdplot_main_coords,pill radius/.initial=1,
pill length/.initial=3]
 draw[top color=red!10,bottom color=red!80!black,middle color=red,shading angle=90-45] 
 plot[variable=x,domain=tdplotmainphi:tdplotmainphi-180] 
 (pgfkeysvalueof/tikz/pill radius*cos(x),pgfkeysvalueof/tikz/pill radius*sin(x),0)
 -- plot[variable=x,domain=tdplotmainphi-180:tdplotmainphi] 
 (pgfkeysvalueof/tikz/pill radius*cos(x),pgfkeysvalueof/tikz/pill radius*sin(x),
 -(pgfkeysvalueof/tikz/pill length-pgfkeysvalueof/tikz/pill radius)+pgfkeysvalueof/tikz/pill radius*sin(x)) -- cycle;
 draw[top color=blue!10,bottom color=blue!80!black,middle color=blue,
 shading angle=90-45] 
 plot[variable=x,domain=tdplotmainphi:tdplotmainphi-180] 
 (pgfkeysvalueof/tikz/pill radius*cos(x),pgfkeysvalueof/tikz/pill radius*sin(x),0)
 -- plot[variable=x,domain=tdplotmainphi-180:tdplotmainphi] 
 (pgfkeysvalueof/tikz/pill radius*cos(x),pgfkeysvalueof/tikz/pill radius*sin(-x),
 (pgfkeysvalueof/tikz/pill length-pgfkeysvalueof/tikz/pill radius)-pgfkeysvalueof/tikz/pill radius*sin(x)) -- cycle;
endtikzpicturequad
begintikzpicture[gap width/.initial=1mm,diameter/.initial=1cm]
 fill[blue!20] (45:pgfkeysvalueof/tikz/diameter)
 arc(45:225:pgfkeysvalueof/tikz/diameter) -- 
 cycle; 
 fill[blue!50] (45:pgfkeysvalueof/tikz/diameter)
 arc(45:-135:pgfkeysvalueof/tikz/diameter) -- 
 cycle; 
 fill[blue!30] (0,0)
 circle[radius=pgfkeysvalueof/tikz/diameter-pgfkeysvalueof/tikz/gap width];
 fill[blue!50] (45:pgfkeysvalueof/tikz/diameter) -- 
 ++ (-sqrt(2)*pgfkeysvalueof/tikz/gap width,0) -- 
 ++ (-135:2*pgfkeysvalueof/tikz/diameter-2*pgfkeysvalueof/tikz/gap width)
 -- (225:pgfkeysvalueof/tikz/diameter) -- cycle;
fill[blue!20] (45:pgfkeysvalueof/tikz/diameter) -- 
 ++ (0,-sqrt(2)*pgfkeysvalueof/tikz/gap width) -- 
 ++ (-135:2*pgfkeysvalueof/tikz/diameter-2*pgfkeysvalueof/tikz/gap width)
 -- (225:pgfkeysvalueof/tikz/diameter) -- cycle; 
endtikzpicture
enddocument