Is Prolonged Intake Of Valium Harmful?
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Detailed Answer:
I read your question carefully and I understand your concern.
I must say on some points I agree with your doctor. Valium is a benzodiazepine. Benzodiazepine drugs are not recommended for long term use and I do not agree with you taking it for such a long time. The reason is that in time they develop dependence (hence the withdrawal effects) and tolerance - meaning over time the same dose is not effective anymore and you need to increase the dose to achieve previous effect. The tolerance is already developing in you, you need you first needed to increase to 10 mg from 5, and now even 10 is not enough anymore. So in the long term Valium is not the answer.
As for Trazodone being given at 25 mg instead of 25, 25 mg is the lowest dose used for trazodone. Even if one wanted to use 5mg they are manufactured only in 50 or 100 mg pills (at least in most countries) so how can you divide that to get 5 mg. So I do not think the dosage was wrong, it was the correct dosage. Of course side effects vary among individuals and you might experience more of them. In your case though I believe side effects were more due to Valium withdrawal.
As for Amitriptyline, it is a substance which I commonly use and with good efficacy. However in your particular case I am a little reluctant. That is because one the main side effects of it is orthostatic hypotension, low blood pressure episodes when standing which can lead to falls, so not commonly used in the elderly, over 65 years of age. Also in your particular case, there is Parkinson's which has the same orthostatic hypotension as one of its symptoms, so the risk is even greater.
Where I disagree with your doctor is the fact Valium was interrupted abruptly. In someone who has been using it for years like you that is not advised, it should be done very gradually over many weeks. So I suggest it is lowered gradually, say by 2.5mg every month up to interruption. As for what to substitute it with ... one alternative may be still Trazodone, if you do not interrupt Valium perhaps won't experience the effects you experienced. If you still feel side effects from Trazodone....another antidepressant may be considered, one with a sedative effect like mirtazapine.
I remain at your disposal for other questions.