Pharmaceutical preparation containing at least folic acid or a folate and tetrahydrobiopterin (BH4) or derivatives thereof used for the treating or preventing cardiovascular or neurological disorders by modulation of the activity of nitric oxide synthase (NOS)

1. A pharmaceutical composition comprising

(1) folic acid or a folate;

(2) tetrahydrobiopterin (BH 4 );

(3) arginine

wherein arginine is present in a unit dosage of 1 mg to 250 mg.

2. The composition as defined in claim 1 wherein folic acid or a folate is folic acid (pteroylmonoglutamate), one or more of the folylpolyglutamates, compounds in which the pyrazine ring of the pterin moiety of folic acid or of the folylpolyglutamates is reduced to give dihydrofolates or tetrahydrofolates, or derivatives of all the preceding compounds in which the N-5 or N-10 positions carry one carbon units at various levels of oxidation, or salt.

3. The composition as defined in claim 1 wherein folate is the natural diastereoisomer of folate.

4. The composition as defined in claim 1 wherein folate is

dihydrofolic acid,

tetrahydrofolic acid,

5-methyltetrahydrofolic acid,

5,10-methylenetetrahydrofolic acid,

5,10-methenyltetrahydrofolic acid,

5,10-formiminotetrahydrofolic acid,

5-formyltetrahydrofolic acid (leucovorin),

10-formyltetrahydrofolic acid,

10-methyltetrahydrofolic acid,

pharmaceutically compatible salts thereof, or a combination of two or more thereof.

5. A composition according to claim 1 , in combination with at least one active substance or at least one adjuvant substance.

6. A composition according to claim 5 , wherein the active substance is pharmaceutically compatible active substance.