Welcome to HCM!
Thanks for posting your query. I am happy to address your questions. As your sister is already in advanced stage and chemotherapy
also would be associated with weakness and tachycardia
. Also side effects which persist or become bothersome when using hydromorphone
are constipation; dizziness
, drowsiness; dry mouth; flushing; light-headedness; nausea; sweating; vomiting. Hence, it could be precipitating her weakness and tachycardia. For cough it would be better to rule out any infectious cause. Hope I have answered your query. If you have any further questions, I will be happy to help. Thanks