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Main portal venous tumor thrombus (PVTT)

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That's why it's important to let your doctor know if you have any of the following conditions before you're prescribed hydroxocobalamin: If you've had an allergic reaction to hydroxocobalamin or any other medicines in the past If you've been diagnosed with low levels of potassium If you have an irregular or fast heartbeat Once you've started taking hydroxocobalamin, you may have some side effects such as pain, swelling, or itchy skin at the point where the syringe was injected

Feeling unusually tired, losing focus, or noticing slower stamina can indicate your levels are dipping