Expat Health Insurance
Cigna Global Health Insurance.
Medical insurance specifically designed for expats. With Cigna, you won't have to rely on foreign public health care systems, which may not meet your needs. Cigna allows you to speak to a doctor on demand, for consultations or instant advice, wherever you are in the world. They also offer full cancer care across all levels of cover, and settle the cost of treatments directly with the provider.
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I can't find any specific information about rituximab in Portugal in particular, but it does appear on the World Health Organization's official list of essential medicines here so I would think you should be able to get it there. Perhaps your current doctor can also advise you on this?
The Expat Arrivals Healthcare in Portugal page has some general information on how the system works, including pharmacies and prescriptions.
Best of luck with the move!
Meagan