DANZIG, on 04 June 2005 - 02:47 PM, said:
Cannabis and interaction with other drugs
Leo Hollister
Although medical cannabis is not officially approved, cannabis has been tried empirically for treating a variety of medical disorders, such as nausea and vomiting associated with cancer chemotherapy, weight loss associated with AIDS, and spasticity from neurological diseases.
In each instance, other drugs are also present. So far, no adverse interactions from such use have been reported. However, this might not reflect the true frequency. Unless one looks for something, one is not likely to find it. The published literature, at least in regard to studies with humans, has been rather silent. Usually this silence indicates that no meaningful interactions have been observed in the real life use of marijuana as compared with experimental studies
One of the most reasonable therapeutic uses of cannabis and THC has been to ameliorate the nausea and vomiting associated with cancer chemotherapy. Thus, cannabinoids will be used simultaneously with many highly toxic cancer drugs. In none of the reports of use of THC or marihuana in patients simultaneously undergoing cancer chemotherapy has there been any mention of increased toxicity of anticancer drugs.
In one animal study in which THC was given with muscle relaxants, it was found to increase the desired effect of the latter drugs. In this case, the interaction might be advantageous.
(Please note: This text has been taken from a scientific article. Some sentences have been changed to improve understandability.). Interactions of cannabis and D9-THC with other drugs. In: Nahas G, Sutin KM, Harvey DJ, Agurell S, eds. Marihuana and medicine. Totowa, NJ: Humana Press, 1999
Franjo Grotenhermen
Cannabis and dronabinol (THC) have been used in combination with a multitude of medications without significant deleterious drug interactions. Clinical studies in the beginning of the 20th century often demonstrated mutual enhancement of therapeutic effects of cannabis preparations and other drugs. In modern therapeutic concepts a combination of cannabis/THC with other medications could also be of benefit for many indications. Cannabis has been used illegally by individuals suffering from many diseases concomitantly with numerous prescription medicines
No unwanted side effects of clinical relevance have been observed to date. Other medicines may enhance or attenuate certain actions of cannabis/THC or certain actions of these medicines may be enhanced or attenuated by cannabis/THC. Moreover, it is possible that certain effects are enhanced and others reduced, as is the case with phenothiazines applied against side effects of cancer chemotherapy. Of greatest clinical relevance is reinforcement of the sedating effect of other psychotropic substances,
Pharmacology, toxicology, and therapeutic potential. Haworth Press, Binghamton/New York 2001, in press
The Medicinal Uses of Cannabis and Cannabinoids, published by Ph Press
Advises the following
Contraindications
Cannabis and cannabinoids. seem to have a very low physical toxicity. As yet there is limited knowledge on the contraindications to the use of cannabinoids as almost all information is derived from anecdotes and from studies on recreational users. As experience grows these may change. Our current contraindications are as listed below.
Absolute contraindications
• There is evidence that cannabis might precipitate a psychotic illness, particularly in those who are at risk of developing such a disorder in the future. Therefore until there is sufficient evidence, a history of psychosis should remain an absolute contraindication (Hall, 1999).
• There is evidence that there may be an interaction with levodopa and similar anti-parkinsonism drugs. Therefore use of this group of drugs is currently considered to be an absolute contraindication.
• Drugs using cytochrome P450 3A4 enzyme as their exclusive mode of metabolism (theoretically fentanyl could be a problem), until further expedience is gained
Relative contraindications
• The effects on the cardiovascular system are varied and cannot be reliably predicted. While this may be of minor importance to a healthy person there may be a risk in the presence of significant hypertension or ischaemic heart disease.
• Many patients are on a range of drugs that may affect both the CNS and the cardiovascular system. As yet we have little knowledge about the interaction of most drugs or herbal medicines with cannabinoids. The metabolism of anticoagulants such as warfarin may be affected.
• Assessing the effects of CBME on patients presenting with a complex range of symptomatology (physical, psychological and social) can present almost impossible problems. Frail and elderly patients may prove extremely sensitive to the side-effects.
• Patients who are intolerant of a wide range of psychoactive drugs. Currently it is impossible to separate the therapeutic from the psy¬choactive effects. Therefore extreme caution and slow titration is essential for this group.
• We already have concerns on the use of morphine and other psychoactive drugs in patients with actual or suspected substance misuse. Control of the use of such drugs is usually very difficult. Some too will have a history of recreational use of cannabis and may see the prescribing of CBME as a route to a regular source of high-grade material. The physician has the responsibility here in ensuring that the prescribed medicine will be used for its specified purpose. The presence in a patient's household of an individual who is a substance misuser/recreational user should also be taken into account. The presentation of the medication in a package which is tamper evident and not easy to divert for illicit use is therefore crucial.
I am a little confused by this: Relative contraindications
• The effects on the cardiovascular system are varied and cannot be reliably predicted. While this may be of minor importance to a healthy person there may be a risk in the presence of significant hypertension or ischaemic heart disease.
Does this means that if someone is NOT taking heart meds, but suffers from heart failure, and suspected coronary blockages (based on unstable angina, acute coronary sysndrome, and angina on exertion) that it could be unwise to take RSO oil? I read on another site that it causes the coronary vessels to constrict, hence, makes the heart work harder. Is this correct?
If this is the case, it could cause a heart attack.
I am unsure if the contra indications here has to do with heart meds, or heart disease? I read much the research out there, but found no evidence of it being beneficial. In one case, there was some benefits but also some downside.
This eve I upped the pin prick dose just a little. I had palpitations for over 30 mins and a little angina like type of twinge. I took liquid magnesium to calm the heart down, which it did. I am wondering the safety in view of my cardiac history.
Thank you.
This post has been edited by HealthSeeker: 06 April 2013 - 11:59 PM