Interactions can be expected between cannabis and a wide range of drugs.  
Nortriptyline is a tricyclic antidepressant.  Cannabis interacts 
adversely with tricyclic andidepressants.  Cannabis, on its own, produces 
tachycardia as a side-effect.  Tricyclics do the same.  Combined, there 
is an additive effect, with a bigger increase in heart rate.  I have seen 
this with cannabis + doxepin (heart rate >150, as well as BP 99/75, 
dizziness and severe anxiety).  In this case, doxepin's hypotensive 
(blood pressure-lowering) effect (another common side-effect of 
tricyclics) was also potentiated.  Tricyclic antidepressants have a 
certain effect on the heart.  This effect can be described as 
cardiotoxicity.  In normal dosage, in individuals with no heart disorder, 
this causes no problems at all.  (In overdosage, tricyclics can produce 
serious cardiac arrhythmias.)  I suspect that in the interaction with 
cannabis, the cardiotoxic effect of tricyclics is somewhat potentiated.  
(I don't know if this has produced hazardous changes in ECG rhythm.)  The 
effects of cannabis + nortriptyline in particular have been documented.

I remember seeing a couple of references to all of this in Martindale's 
"Extra Pharmacopoeia", 29th edition, under 'Cannabis', but I haven't read 
them.

***************************** Article Separation ***************************

From: [R G D 101] at [psuvm.psu.edu]
Date: 4 Oct 91 19:20:40 GMT
Newsgroups: alt.drugs
Subject: UN Decision

Having seen references to a UN decision to change marijuana from a schedule
I to schedule II drug, I decided to try and track down a copy of this
decision. After many visits to the documents section, one of the reference
librarians found the decision for me. I am posting it just for general
information, and so that anyone else that wants it can obtain a copy. It
was found in the UN Microfiche set # E/CN.7/1991/26, and it is on page
98.
                      Decision 2 (XXXIV)
      Transfer of delta-9-THC and its stereochemical variants
          from Schedule I to Schedule II of the Convention
                 on Psychotropic Substances, 1971.

    At its 1045th meeting, on April 29,1991, the Commission on Narcotic Drugs,
in accordance with article 2, paragraphs 5 and 6, of the Convention on
Psychotropic Substances, 1971, decided that delta-9-tetrahydrocannabinol (also
referred to as delta-9-THC) and its stereochemical variants should be
transferred from Schedule I to Schedule II of that Convention.

Wouldn't it be interesting to see if Bush pushes for this as hard as he
does when UN decisions affect another country, such as Iraq?

Anyone requiring any additional information can e-mail to me.