To begin with, it is important to note that vitamin B 12 injections can be prescribed for several reasons. Many times, it could simply be a result of non absorption of vitamins into your body's system. The malabsorption responsible for creating a deficiency may require for you to take intravenous vitamins. At this point is important to note and that vitamin B 12 can be prescribed by a doctor.
Nevertheless, irrespective of the reasons that have led you to take these injections, it is still abnormal to have dark colored urine. In some cases, it is considered normal to have dark yellow or even orange colored urine as a consequence of taking specific vitamins. You should also bear in mind that this abnormality of dark colored urine usually lasts for up to seven days or even more. In any event, it is very unlikely to have dark colored urine, which is so dark that it may lead you to confuse it for blood, and if such is the case, then it is important that you seek a doctor's advice rather than resort to home remedies.
Although research has shown us that there are many overt and obviously apparent side-effects from taking vitamin B12 injections, the production of dark red to deep brown colored urine is definitely not one of them. It would be highly recommended, under the circumstances, to seek immediate medical assistance. Ideally, you should discuss your condition with the doctor who prescribed these injections to begin with. Your doctor will be in a position to explain to you about the connection between the injections and the color of your urine. This particular injection or series of injections can be responsible for various other side-effects.
The most significant side-effects are heart palpitations and mild diarrhea accompanied by a feeling of uneasiness and nausea. Although, these are the most frequently noticed side-effects brought on by these injections, they do not manifest themselves strongly enough to affect you with any degree of discomfort for a significant amount of time. There is a strong possibility that you may have developed a certain kind of skin rash, quite similar to hives, leading to excessive itchiness and inflammation. There have been rare cases where the side-effects have extended to the development of certain irregularities in breathing. Do not delay the situation any longer, and once again we reiterate that you visit and consult your doctor who prescribed the injections, as only he will be able to give you a clearer assessment of your condition.
answered by G M