Ached all over the following day; diarrhoea; oxygen saturation decreased/Oxygen dropped into the 80's, patient's oxygen has been back into the 90s [Oxygen saturation decreased; sick to her stomach; sinus infection; Intestinal distress; Strong smells such as perfume, christmas trees and cleaning solvent make her sinuses get inflamed; Strong smells such as perfume, christmas trees and cleaning solvent make her sinuses get inflamed and irritated; Initial information was received  on 29-Sep-2023 regarding an unsolicited valid  non-serious case received from a consumer/non-hcp.  This case involves a 78 years old female patient (68 kg) who experienced ached all over the following day, diarrhoea, oxygen saturation decreased/oxygen dropped into the 80's, patient's oxygen has been back into the 90s [oxygen saturation decreased, sick to her stomach, sinus infection, intestinal distress, strong smells such as perfume, christmas trees and cleaning solvent make her sinuses get inflamed and strong smells such as perfume, christmas trees after receiving influenza vaccine and while treated with tetracycline hydrochloride, treprostinil sodium [Tyvaso].  The patient's past medical treatment(s), vaccination(s) and family history were not provided. At the time of the event, the patient had ongoing Pulmonary arterial hypertension.  Concomitant medications included triamcinolone acetonide (nasacort); ketotifen (ketotifen); fexofenadine hydrochloride (allegra); riociguat (adempas); simvastatin; fluticasone furoate, umeclidinium bromide, vilanterol trifenatate (trelegy); levothyroxine; furosemide (lasix); sertraline; oxygen; macrogol 400, propylene glycol (systane); ipratropium; levosalbutamol hydrochloride (levalbuterol); gabapentin; polyvinyl alcohol (blink [polyvinyl alcohol]); erythromycin; sulfamethoxazole, trimethoprim (bactrim); diclofenac sodium (voltaren); cetirizine hydrochloride (cetrizine); beclometasone dipropionate (qvar); vitamin d3 (vitamin d3); vitamin c [ascorbic acid] and elasomeran (moderna covid-19 vaccine) for immunisation.  On 08-Sep-2022, the patient started taking treprostinil sodium  (Inhalation powder dry) at a dose of 32 ug 4 times a day (QID) via inhalational route (batch number: 000393P, expiry date: 31-May-2025 , strength: unknown) for Primary pulmonary arterial hypertension (Pulmonary arterial hypertension).  On an unknown date and month in 2023, the patient received an unknown dose of suspect influenza vaccine produced by unknown manufacturer (unknown formulation) (lot number, expiry date, strength, was unknown) via unknown route in unknown administration site for Influenza immunization. The information on the batch number will not be available.  On an unknown date and month in 2023, the patient started taking tetracycline hydrochloride (form, strength, dose, frequency, route, lot number, expiration date: unknown) for Sinus infection (Sinusitis) and Respiratory syncytial virus immunization.  On an unknown date and month in 2023 the patient had ached all over the following day (pain), diarrhoea, oxygen saturation decreased/oxygen dropped into the 80's, patient's oxygen has been back into the 90s [oxygen saturation decreased (oxygen saturation decreased), sick to her stomach (nausea), sinus infection (sinusitis), intestinal distress (abdominal discomfort), strong smells such as perfume, christmas trees and cleaning solvent make her sinuses get inflamed (paranasal sinus discomfort) and strong smells such as perfume, christmas trees and cleaning solvent make her sinuses get inflamed and irritated (paranasal sinus inflammation) (unknown latency) following the first and last dose intake of tetracycline hydrochloride, treprostinil sodium and (unknown latency) following the administration of influenza vaccine.  Relevant laboratory test results included: Oxygen saturation - In 2023:  [back into the 80s] then  [back into the 90s]  Action taken with treprostinil sodium (Tyvaso) and tetracycline hydrochloride was unknown and with influenza vaccine was not applicable.  It was not reported if the patient received a corrective treatment for the events.  At time of reporting, the outcome was Unknown for all other events and was Recovering/Resolving for Abdominal discomfort.