INTRAVENOUS. Album: Extremities, Dirt and Various Repressed Emotions.

A lot of changes in this song... Those are the main riffs, in order of appearance.
Listen to the song to feel the different parts of it...
The right hand is playing altenating up/down strokes.

INTRO Let ring...
....................................................X3
D-------------0----------------------)---------------)
A------------------------------3-----)------4--------)
F--5^3^2------------0^2^3------3-----)--2^3----------)
C------------------------------------)---------------)
G----------0-----0----------0-----0--)---------------)
D------------------------------------)---------------)

MAIN RIFFS (verses)

Geordie alternates those riffs... G-0 string is palm-muted.
G-0 string = uncessant up/down strokes, C-F-A chords = up-strokes

D----------------------------------------------------------|
A--------------7---7-------7-------------------------------|
F--8-----------8---8-------8---8---------------2-----------|
C--8--7--------7---7-------7---8--7--------2---2---------2-|
G-----0--0-0-0---0---0-0-0---0----0--0-0-0-0-0-0-0-0-0-0-0-|
D----------------------------------------------------------|

D----------------------------------------------------------------|
A-----------------7---7-------7----------------------------------|
F--8--------------8---8-------8------8---------------2-----------|
C-----8--7--------7---7-------7---8-----7--------2---2---------2-|
G--------0--0-0-0---0---0-0-0---0-------0--0-0-0-0-0-0-0-0-0-0-0-|
D----------------------------------------------------------------|

D----------------------------------------------------------------|
A-----------7-7---7---7-------7----------------------------------|
F--8--------8-8---8---8-------8------8---------------2-----------|
C-----8--7--7-7---7---7-------7---8-----7--2-2---2---2-------2---|
G--------0------0---0---0-0-0---0-------0--0-0-0-0-0-0-0-0-0-0-0-|
D----------------------------------------------------------------|

D-------------------------------------------------------------|
A-----------------7-----------7-------------------------------|
F--8--------------8-----------8------8--------------2---------|
C-----8--7--------7-----------7---8-----7-------2---2-----2---|
G--------0--0-0-0---0-0-0-0-0---0-------0-0-0-0-0-0-0-0-0-0-0-|
D-------------------------------------------------------------|

BREAK (X2) Let ring...

D-------------2----------------2^3^2--)
A----------1----------------1---------)
F-------0----------------0------------)
C-------------------------------------)
G--3----------------3-----------------)
D-------------------------------------)

CHORUS (let ring)
Geordie seems to play different phrases (?) with the same chords. Here are the main 
(?)..

D----------------------------------------|
A----------------------------------------|
F----6------------6------6-------------6-|
C------6--------6----------6---------6---|
G-4------4--4^5-------6-------6--6^7-----|
D----------------------------------------|


CHORUS
Can be played this way (let ring…)

D--------------------------------------------|
A--------------------------------------------|
F----6--6-6-----6--6-6-----6--6-6-----6--6-6-|
C----6--6-6-----6--6-6-----6--6-6-----6--6-6-|
G-4----------5----------6----------7---------|
D--------------------------------------------|

RIFF 2............................RIFF 3 (X2)

D-------------------------)--------------------------------)
A-------------------------)------------------------------4-)
F--8----------------8-----)------------------------------3-)
C-----8--7----------8--7--)--7-5-7--2-5-7--7--7--5-7-5-2---)
G--------0--------------0-)--0---0--0-0-0--0--0--0-0-0-0---)
D-------------------------)--------------------------------)

RIFF 4
..............................X2
D-------------------------------)---------------------------------|
A--9--9-x-9--9--9-9-----------9-)--10^9---------------------------|
F--9--9-x-9--9--9-9--10^9-----9-)-------10^9^10^9-----------------|
C--9--9-x-9--9--9-9--------9-10-)-----------------10^9^10^9^10-12-|
G-------------------------------)---------------------------------|
D-------------------------------)---------------------------------|

RIFF 5 Let ring

D--------------0-----------------------)
A--------------1------------------3----)
F--5^3^2--------------0^2^3-------3----)
C--------------------------------------)
G-----------0-----0------------0-----0-)
D--------------------------------------)

RIFF 6 ( play the main riff + this riff =  riff 6)

D-------------2-------------2^3^2-----------2^3^2-----2-----2--------|
A----------1-------------1----------------1-------------1----1---1---|
F-------0-------------0-----------------0-----------------0----0---0-|
C--------------------------------------------------------------------|
G--3-------------3------------------3--------------3-----------------|
D--------------------------------------------------------------------|